60 Years on the U.S.-Mexico Border

U.S. Border Patrol inspectors Albert F. Koenig, left, and William A. Sherrill, right, locate fresh footprints in the desert along the border to Mexico, some 12 miles west of Calexico, Calif., August 11, 1950. With Mt. Signal as a distinct directional point in the background, this area is frequently used by illegal immigrants to enter the United States. After fresh prints are located and their direction is radioed to the patrol car crew, the prints are brushed out. (AP Photo)

Charles Knight, Border Patrol Inspector of the El Centro, Ca., sector, checks the identification card of a legal Mexican farm worker on Imperial Valley tomato farm near the Calexico border in Aug. 1951. (AP Photo)

Two illegal Mexican immigrants, Pedro Vidal, left, and Canuto Garcia, right, are fingerprinted by U.S. Border Patrol inspectors Paul Watson, left, and N. Franklin Davidson, right, at a detention camp at El Centro, Calif., August 11, 1951. After processing they will be airlifted back to their homes in Sinaloa, Mexico. (AP Photo)

U.S. Border Patrol inspectors Fred H. Voight, left, and Gordon MacDonald, right, both from the El Centro U.S. Border Patrol sector headquarters, are searching two Mexican nationals, Pedro Vidal, with bag, and Canuto Garcia, right, shortly after the two men illegally crossed the border from Mexico, west of Calexico, Calif., August 11, 1951. Thousands of Mexican laborers are trying to cross in this area into the United States, where they attempt to work on the farms of the nearby Imperial Valley. (AP Photo)

U.S. Border Patrol inspector Arnold Faust opens and checks empty refrigeration compartments of a train, after it crossed the border from Mexico to the United States, at Calexico, Calif., on August 11, 1951. The train slows down and each car is inspected for illegal Mexican aliens trying to cross into the United States, where they attempt to work on the farms of the nearby Imperial Valley. After the train is inspected, the compartments are iced at warehouses for hauling fruit and vegetables. (AP Photo)

U.S. Border Patrol officer Richard McCown shows how he found Felipe Ramirez Perez, a 6-foot illegal Mexican immigrant, curled up on the engine beneath the hood of this automobile, at the U.S.-Mexican border at San Diego, Calif., March 15, 1954. Perez is held for illegal entry, awaiting deportation, and Felix Mercado Gutierrez, the driver of the car, is charged with attempt to smuggle Perez into the United States. (AP Photo)

United States customs inspectors at the San Diego, Calif., border station check automobiles returning from Tijuana, Mexico, November 11, 1958. (AP Photo)

Mexican farm workers are shown being processed at the labor center at Hidalgo, Texas, June 18, 1959. Most of these workers, who are legally employed under the Bracero Program and protected by minimum wage law, stay in Texas, but some go as far as Michigan to work. (AP Photo)

Motorists and pedestrians coming from Los Algodones, Mexico, wait for U.S. Customs and Immigration officer Owen T. Miller to open the border gates into the United States at Andrade, Calif., October 13, 1967. A sign at the fence says the opening hours are from 8 a.m. to 6 p.m. daily. (AP Photo)

This warning sign states the penalties for bringing marijuana across the border from Mexico into the United States, at Laredo, Texas, May 25, 1970. (AP Photo)

Gigantic traffic jams at the U.S. border to Mexico in 1969 are the result of "Operation Intercept," a campaign by U.S. President Nixon to stop the narcotics and marijuana smuggling. (AP Photo)

U.S. Border Patrol officer Ed Pyeatt, on horseback, leads a group of illegal aliens down the hillside toward waiting vans for the trip to a holding center at the Chula Vista border station. According to Pyeatt, a monthly average of 10, 000 illegals are captured in this 6-mile stretch of border. (AP Photo)

U.S. Border Patrolmen Ed Pyeatt, right, and Steve Shields, left, march five illegal aliens to the holding center in Texas shortly after their apprehension in the desert, August 18, 1981. (AP Photo/Lennox McLendon)

U.S. Border Patrol officer Ed Pyeatt consoles an unidentified illegal immigrant sitting in a cell at Chula Vista station, a border town to Mexico, August 18, 1981. "With a government that doesn't care for them, indecent living conditions and poverty, you can't blame them." says Pyeatt. (AP Photo/Lennox McLendon)

An officer of the U.S. Immigration and Naturalization Service discovers an undocumented immigrant under the floor of a smugglers van, at a check point at San Clemente, Texas, January 16, 1984. A total of five illegals were hidden in the compartment. (AP Photo/Phillip Davies)

A U.S. Border Patrol agent escorts a group of seven illegal immigrants from Mexico after their arrest on United States territory, May 26, 1986. (AP Photo)

Family members and friends are carrying the caskets of their loved ones to the city hall of Pabellon, Mexico, July 7, 1987. Six people from this small town were among the 18 illegal immigrants found dead by U.S. Border Patrol agents on July 1, 1987, in Sierra Blanca, West Texas, after they suffocated in a locked-up railroad container. (AP Photo/John Hopper)

Fidel Garcia, 29, right, an admitted alien smuggler, and U.S. Border Patrol agent Stuart Kutz shake hands after calling a truce to discuss the application deadline for amnesty under the immigration law near the border area of Otay Mesa, San Ysidro, May 3, 1988. (AP Photo/Jimmy Dorantes)

Plain clothes agents of the Beta Group, a Mexican law enfrocement unit similar to the U.S. Border Patrol, monitor the gates at the border station at San Ysidro, Mexico, February 6, 1992. The agents were stationed to stop a recent practice by illegal immigrants of rushing through the gates into the United States. (AP Photo/Lenny Ignelzi)

U.S. Border Patrol agent Preston Schleinkofer looks out over the Rio Grande River near Laredo, Texas, Monday, Feb. 5, 2001, on a day when he didn't see one illegal immigrant cross on his shift. Arrests of illegal immigrants have dropped all along the Mexico-U.S. border. Experts say that could be a sign that Mexicans are staying home to enjoy a growing economy and growing hopes under the first opposition president in seven decades. (AP Photo/Gregory Bull)

U.S. Border agents Tom Castloo, left, and Bob Zambramo sail down the Rio Grande using an airboat near Del Rio, Texas, Wednesday, April 25, 2001. The Del Rio Sector will begin using eight airboats to help reduce the flow of illegal immigrants and drugs into the United States Sunday, patroling about 205 miles of U.S.-Mexico border along the Rio Grande. The airboat program in the first for the U.S. Border Patrol. (AP Photo/Eric Gay)

Mexicans look towards the American shore of the Rio Grande River while scouting for U.S. Border Patrol agents from Nuevo Laredo, Mexico, May 13, 2001. Mexico and the United States on Friday, June 22, 2001, announced their most sweeping effort yet to reduce the deaths of migrants, including campaigns to warn migrants of risks, a crackdown on people-smugglers and experiments with Border Patrol agents firing pepper gas instead of bullets. (AP Photo/John Moore)

U.S. Border Patrol agents stand watch over a group of illegal immigrants after detaining them west of Laredo, Texas May 14, 2001. Mexico and the United States on Friday announced their most sweeping effort yet to reduce the deaths of migrants, including campaigns to warn migrants of risks, a crackdown on people-smugglers and experiments with border patrol agents firing pepper gas instead of bullets. (AP Photo/John Moore)

A member of the U.S. Border Patrol stands guard on the U.S.-Mexico border near the Rio Grande River at the beach in Boca Chica, Texas, Saturday, June 16, 2001. Nine years of drought, a proliferation of choking river weeds and a complicated system of water rights have taken their toll on the nation's second-longest river. Once a navigable waterway, the river now is tapped out before it finishes, overtaken by beach sand that has grown to a 300-foot barrier (AP Photo/LM Otero)

The United States Border Patrol's BORSTAR unit demonstrates its rescue technique in the Otay Mesa border area in San Diego Monday, July 23, 2001. The demonstration was performed for the visit of U.S. Attorney General John Ashcroft. BORSTAR stands for Border Search Trauma And Rescue. (AP Photo/Lenny Ignelzi)

Relatives meet through the fence that marks Mexico's border with the U.S. Tuesday, July 24, 2001, in Tijuana, Mexico, after not seeing one another for more than eight years. From left to right, Sofia and her husband Guillermo Ramirez, who live in Ensenada, Mexico, talk with Linda (Guillermo's sister) and Tony Simiano, who live in Los Angeles, Calif. Like many others separated by the border in this region, they spent the afternoon visiting through a chain-link fence under the watchful eyes of Border Patrol agents. (AP Photo/Tomas Escalante)

Elvira Manzana, 20, left, of Guadalajara, Mexico, eats her last cracker while waiting for temperatures to drop and nightfall to help conceal her and her family as they cross illegally into the United States along the Arizona border, outside the town of Sasabe, Mexico, Wednesday, May 29, 2002. Her father, behind second from left, who did not give his name, stands with her son Jesus Isreal, 4, and her sister, who did not give her name. All along the 2,000-mile border, illegal immigration is down as jobs have dried up in the United States following Sept. 11 attacks. Though the crossings are beginning to pick up again, U.S. Border Patrol arrests from Oct. 1 to May 14 were the lowest in a decade, down 33 percent from last year. (AP Photo/Gregory Bull)

A group of agents from Grupo Beta, left, the Mexican government migrants' aid agency, stand on one side of a livestock fence that marks the border with the United States, while U.S. Border Patrol agent Arnie Villareal, right, advises them of search for a woman suffering from dehidration outside the town of Sasabe, Mexico, Wednesday, May 29, 2002. The other Border Patrol agent is unnamed. All along the 2,000-mile border, illegal immigration is down as jobs have dried up in the United States following Sept. 11 attacks. Though the crossings are beginning to pick up again, U.S. Border Patrol arrests from Oct. 1 to May 14 were the lowest in a decade, down 33 percent from last year. (AP Photo/Gregory Bull)

A Mexican man who did not give his name gestures towards the Arizona border, as he waits for darkness and cooler temperatures to make an illegal crossing from outside the town of Los Vidrios, Mexico, Tuesday, June 4, 2002. All along the 2,000-mile border, illegal immigration is down as jobs have dried up in the United States following Sept. 11 attacks. Though the crossings are beginning to pick up again, U.S. Border Patrol arrests from Oct. 1 to May 14 were the lowest in a decade, down 33 percent from last year. (AP Photo/Gregory Bull)

Three Mexicans walk with water bottles just yards from the Arizona border, outside the town of Sasabe, Mexico, Wednesday, May 29, 2002. All along the 2,000-mile border, illegal immigration is down as jobs have dried up in the United States following Sept. 11 attacks. Though the crossings are beginning to pick up again, U.S. Border Patrol arrests from Oct. 1 to May 14 were the lowest in a decade, down 33 percent from last year, to 569,507. (AP Photo/Gregory Bull)

A group of Mexican men wait in a truck to be transported, less than a mile from the border with Arizona outside of Sasabe, Mexico, Jan. 12, 2003. Where a few bold ranchers used to be the only ones stopping migrants traipsing across their land, now retirees and business owners are slipping on hiking boots, donning images of U.S. flags and bald eagles, and spending their weekends standing on the border in the name of national security.(AP Photo/Gregory Bull)

** FILE ** Chris Simcox, national leader of the Minuteman Civil Defense Corps, lower right, wearing yellow vest, and a group of trainees for the civilian patrol group Civil Homeland Defense, watch as a jeep carrying Mexican Army soldiers pass by on the Mexican side of the border, Jan. 12, 2003 near Palominas, Ariz. Volunteer offers are flooding into the Minuteman border watch group over its ultimatum to build secure fencing on the Mexican border unless President Bush militarizes the border and adds new security fencing, spokesmen said Friday, April 21, 2006.(AP Photo/Gregory Bull, File)

Senior Border Patrol Agent Monica Monroy, a member of the San Diego Sector Horse Patrol, watches pedestrians as they approach the border between the United States and Mexico, in San Ysidro, Calif., Tuesday, March 18 2003. A nationwide Orange Alert has caused the call for additional security measures at the border crossing. (AP Photo/Tim Tadder)

New Mexico Army National Guard Spc. Johnnie Whelan uses a joystick to position a camera, set on infrared mode, that is used to detect illegal immigrants as they cross the border from Mexico into the United States in southern New Mexico April 15, 2003, near Deming, N.M. Whelan and other New Mexico National Guard troops support the U.S. Border Patrol at this high-tech monitoring station. (AP Photo/Chris Roberts)

Robert Bonner, left, the head of the Department of Homeland Security's Bureau of Customs and Border Protection, is helped into a U.S. Border Patrol helicopter Monday, Aug. 11, 2003, as he prepares to view the U.S.-Canadian border from the air. Bonner was touring U.S. Customs, Immigration, Agriculture, and Border Patrol operations in Blaine, Wash., where Interstate Highway 5 crosses into Canada. (AP Photo/Ted S. Warren)

Migrants, who were part of a massive deportation, gives bread to ducks in a public park in Ciudad Juarez Sept. 24, 2003, in Mexico. U.S. officials call it humanitarian, Mexico calls it abusive: migrants caught in the dangerous desert areas of Arizona are being put aboard planes by the border patrol and deported at border points hundreds of miles away in Texas, in many cases to cities in Mexico they've never seen before.(AP Photo/Jose Luis Magana)

Mexican and Brazilian migrants walks in Desert north of Sasabe U.S. after been detained by Border Patrol agents Oct. 3, 2003. U.S. government estimates of the number of undocumented Mexican migrants in the United States rose from 2 million in 1990 to 4.8 million in 2000.The North American Free Trade Agreement, implemented Jan. 1 1994, was supposed to bring more jobs, higher wages and reduce the need for Mexicans to head north.(AP Photo/Jaime Puebla)

** ADVANCE FOR MONDAY OCT. 20 ** Two U.S. Border Patrol agents stand by their vehicles while watching the U.S./Mexico border above Goat Canyon in Imperial Beach, Calif. Tuesday, Oct. 14, 2003. Behind them is a section of the original border fence in disrepair. The federal government wants to lengthen a second fence several miles to further control the flow of illegal immigrants in the area, but it is meeting resistance from environmentalists. (AP Photo/Denis Poroy)

Crosses placed by human rights activists on a section of border wall that separates San Diego from Tijuana read "Unidentified" in Spanish or bear the names of people who died while crossing to the United States on Wednesday, Jan. 7, 2004 in Tijuana, Mexico. A U.S. Border Patrol vehicle can be seen in the background as well as a second border fence. (AP Photo/David Maung)

A crowd of marchers heads north from the Port of Entry in Sasabe, Sonora, Mexico, Monday, May 31, 2004, at the beginning of the march in protest of migrant deaths. About 30 of the marchers plan to walk the entire 75 miles to the Border Patrol station in Tucson, Ariz. (AP Photo/Arizona Republic, Jack Kurtz)

With Mexico to the right and the United States to the left, Kathy Snell, of Californina, raises the U.S. flag on the fence seperating the U.S./Mexican border Monday, April 4, 2005 near Naco, Ariz. Snell is part of the MinuteMan Project that is patroling a 23 mile stretch of border between Douglas, Ariz. and Naco, Ariz. Arizona has been the focal point for illegal entries from Mexico for years, since Border Patrol crackdowns in California and Texas took hold. The area has been among the most active smuggling corridors and has previously attracted several civilian patrol operations.(AP Photo/Matt York)

Tiny robot helicopter caused a mild sensation at the opening of the Farnborough Air Show in Hampshire, England, Sept. 5, 1976. The remote-controlled Westland Wisp spy-in-the-sky helicopter has been developed for army or police use for aerial surveillance. The plane can be equipped for transmitting television pictures back to base and is seen as a means of helping security forces patrolling border areas. The plane could also be of use in non-military roles such as fire-spotting and traffic watch duties. (AP Photo/Robert E. Dear)

FOR USE WITH FEATURE PACKAGE FOR WEDNESDAY, MAY 22--U.S. Border Patrol agent Hector Martinez watches as suspected illegal immigrants are transferred to a transport van April 3, 1996 in Campo, Calif., near the United States-Mexico border. The two men were apprehended in the rough terrain in eastern San Diego county during a pursuit of a larger group. (AP Photo/Denis Poroy)

U.S. Border Patrol Agent Ricardo Marin, left, looks along the Mexican side of the Rio Grande, Wednesday, April 28, 2004. Marin, a four-year veteran with the Border Patrol, has been on a boat on the Rio Grande for one month. Marin and his partner, U.S. Border patrol agent Jesse Arellano, a 20 year veteran, patrol the river at different times of the day looking for illegals and drug smugglers. (AP Photo/Brad Doherty)

** ADVANCE FOR SUNDAY, JULY 11 ** Illegal immigrants are loaded into U.S. Border Patrol vans, Tuesday, May 4, 2004, on the Tohono-O'Odham Indian Reservation in Topowa, Ariz. The illegal immigrant trade has increased crime in Arizona, the busiest illegal crossing point along the U.S.-Mexico border. The federal government has launched a massive immigration crackdown in Arizona which they hope will deter some crossers but wil also force crossers to find alternate crossing points. (AP Photo/Matt York)

** ADVANCE FOR MONDAY, JULY 12 ** Tohono O'Odham police officer Vincent Garcia walks through a trash dump, May 5, 2004, on the Tohono-O'Odham Indian Reservation in Arizona. Illegal immigrants from Mexico and other Latin American countries have created trails of refuse over the years while crossing into the United States. The Border Patrol has employed the use of unmanned aircraft to target people, not trash, but success with catching illegal crosses will have a direct effect on the trash problem according to the Border Patrol. (AP Photo/Matt York)

Undocumented immigrants sit on the floor of a drop house in Yuma, Ariz., Tuesday, July 13, 2004, after being detained by U.S. Border Patrol agents. Agents apprehended 42 undocumented immigrants at the house Tuesday, authorities said. Authorities determined that the immigrants, who were all Mexican and smuggled across the border, had stayed at the house for about a day. Smugglers sometimes use drop houses to hide undocumented immigrants before they are moved to other places in the country. (AP Photo/TheSun, Charles Whitehouse)

** ADVANCE FOR MONDAY, SEPT. 13 ** Federal agents round up a group of suspected undocumented immigrants, near Three Points, Ariz., July 19, 2004. The group was tracked by federal agents flying in a Black Hawk helicopter. The large, reliable Black Hawk, long a staple of Army air operations, now is a cog for the Customs Service, whose officers are participating in joint air operations across southern Arizona with the Border Patrol, its sister agency. (AP Photo/John Miller)

Two men walk next to the wall ending into the ocean that separates the U.S. from Mexico as a U.S. Border Patrol jeep is seen parked next to the wall in Tijuana, Mexico in this Oct. 18, 2004 file photo. Cabinet ministers and security chiefs from the 34 countries of the Americas start meeting in Port-of-Spain, Trinidad, Wednesday, Feb. 16, 2005 to discuss border security, drug smuggling and terrorism. (AP Photo/Dario Lopez-Mills, file) **EFE OUT**

Minuteman Project volunteer "Randy" of Las Vegas, patrols the U.S./Mexican border, Monday, April 4, 2005, along border road near Naco, Ariz. Members of the Minuteman Project say their mission is to stop the flow of illegal immigration, a job they say federal authorities are failing to do. Arizona is the most porous state along the United State's border with Mexico. (AP Photo/Matt York)

A Border Patrol agent checks a vehicle on Interstate 91 at a checkpoint in Hartford, Vt., May 13, 2005. The U.S. Border Patrol has dramatically curtailed operations at the traffic checkpoint, 97 miles from the Canadian border. Assistant Chief Patrol Agent John Pfeifer said the cuts were not in response to criticisms about government intrusions nearly 100 miles from the border, but were due to more staff being needed elsewhere, particularly the southwestern United States. (AP Photo/Toby Talbot)

** ADVANCE FOR WEEKEND EDITIONS, JULY 23-24 **Illegal immigrants are loaded on to a transport bus by Border Patrol agents near the Tohono O'odham Nation in Arizona on June 16, 2005. The reservation is part of the Border Patrol's Tucson Sector_the busiest place in the country for illegal border crossings. (AP Photo/Laura Rauch)

** ADVANCE FOR WEEKEND EDITIONS, JULY 23-24 **Border Patrol agents and immigrants surround another illegal immigrant as he waits to be loaded on a transport bus near the Tohono O'odham Nation in Arizona on June 16, 2005. The reservation is part of the Border Patrol's Tucson Sector__the busiest place in the country for illegal border crossings. (AP Photo/Laura Rauch)

U.S. Border Patrol agent Glenn Merrill, foreground, radios field agents the positions of possible illegal immigrants Tuesday Oct. 24, 1995 in San Diego. Merrill monitors part of a network of over 600 seismic sensors that detect movement near the U.S./Mexico border. (AP Photo/Denis Poroy)

US Border Patrol Agents watch a group of people sitting on an aqueduct just behind the fence along the US/Mexico border, a traditional staging area for illegal immigration, just west of the San Ysidro Port of Entry Tuesday Jan. 16, 1996 in San Ysidro, Calif. (AP Photo/Fred Greaves)

United States Border Patrol Agent Dean Eppen searches for the footprints of a group of illegal immigrants in Campo, Calif. near the U.S.-Mexico border, Wednesday, April 3, 1996. In the backround are the lights of Tecate, Mexico. Eppen, who works alone, often follows large groups of illegal immigrants through the rugged area in eastern San Diego county. (AP Photo/Denis Poroy)

Protesters with the group "March Without Borders" encourage a large group of people on the Mexican side of the U.S.-Mexico border to cross illegally Saturday April 13, 1996 in San Diego. The 50 protesters helped at least eight people to cross the border illegally, while U.S. Border Patrol agents watched from a distance. (AP Photo/Denis Poroy)

Border Patrol supervisor William "Doc" Doolittle stands north of the U.S.-Mexico border near Smugglers Gulch Wednesday, May 8, 1996, in San Diego. The steep ravine, used by generations of smugglers, is one of many landmarks used by patrol agents to orient themselves in the monotonous borderland. (AP Photo/San Diego Union-Tribune, John Gastaldo)

A U.S. Border Patrol agent drives along the U.S.-Mexico border in Jacumba, Ca. Friday, Sept. 13, 1996 as men wait on the Mexican side for sunset to attempt an illegal crossing from Jacume, Mexico. (AP Photo/Susan Sterner)

An unidentified U.S Border Patrol agent, right top, watches a group of people waiting to cross the U.S./Mexico border illegally Tuesday, March 5, 1996, in eastern San Diego county. The San Diego Sheriff's Department announced Wednesday Dec. 18, 1996, that they would be assigning six officers to assist the U.S. Border Patrol in stemming the flow of drugs in eastern San Diego county. (AP Photo/Denis Poroy)

U.S. Border Patrol agent John Bryant marches a group of illegal immigrants across a stretch of the Yuha Desert after a Border Patrol helicopter spotted the group hiding in the brush Tuesday, Aug. 26, 1997 near El Centro, Calif. The temperature in the desert was 116 degrees but the immigrants, who have been forced east because of Operation Gatekeeper in the San Diego area, are risking their lives trying to cross at a rate four times higher than in previous years. (AP Photo/Lenny Ignelzi)

Phil Edwards, electronics technician for the U.S. Border Patrol, uses a crank to manually turn surveillance cameras during a demonstration in Albuquerque, N.M.,Wednesday, Nov. 5, 1997. The two cameras, a thermo imager, right, and a day time camera, left, are on display during the Immigration and Naturalization Service's annual conference. (AP Photo/Eric Draper)

Youths near the U.S. - Mexican border try to outsmart a U.S. border patrol agent in a four-wheel drive vehicle by pretending to run one way and take off in another direction, but they were eventually caught near Douglas, Ariz., Jan. 28, 1998. (AP Photo/Tucson Citizen, Mary Chind)

U.S. Border Patrol agent Sal Zamora looks down into the exit of a 400-yard passageway that goes under the U.S.-Mexico border between San Diego and Tijuana, Mexico, on the San Diego side Tuesday, July 7, 1998. The tunnel was discovered in 1993 and then sealed with galvanized steel reinforcing rods. Smugglers apparently unsealed it and were using it to smuggle people north of the border officials say, after discovering 33 undocumented aliens near it Sunday night. (AP Photo/Union-Tribune, John Gibbins)

A skull lies in the dirt in a remote area 30 miles north of the U.S.-Mexico border near Laredo, Texas on Friday, July 24, 1998, as a U.S. Border Patrol helicopter flies by. The remains were spotted from the air and ground agents moved in to recover them. So far this year, ranchers and border patrol agents have found 43 bodies of illegal immigrants in South Texas. ``We'll find skulls out there and won't find the rest of them,'' said Daniel Perales, field operations supervisor for the border patrol in Laredo. (AP Photo/LM Otero)

Jorge Alvarez, who lives just south of the border fence in the Colonia Libertad area of Tijuana, Mexico, watches as San Diego Police department investigators survey the crime scene Monday Sept. 28, 1998, where Oscar Abel Cordoba Velez was shot to death by a border patrol agent on Saturday night. Cordoba allegedly threatened the border patrol agent with a rock. (AP Photo/ Union-Tribune, John Gibbins)

A group of undocumented immigrants, forced to hold their hands above their heads, is escorted across a field by a U.S. Border Patrol agent near across Calexico, Calif. Monday, July 19, 1999. In recent weeks, border patrol agents have reported shots fired at them from neighborhoods in Mexicali, Mexico which is just across the border. (AP Photo/Denis Poroy)

President Bush makes remarks after touring the Texas/Mexico border on Tuesday, Nov. 29, 2005 in El Paso, Texas. From left is Secretary of Homeland Security Michael Chertoff, Deputy Chief Patrol Agent of El Paso Sector Border Patrol Paul Beeson, Bush, and Gov. Rick Perry, R-Tex. (AP Photo/Evan Vucci)

An unidentified man climbs the fence of the international border to rise the Mexican flag during a protest march against Friends of the Border Patrol in Calexico, Calif., on Saturday, Sept. 17, 2005. (AP Photo/Imperial Valley Press, Sergio Estrada).

** ADVANCE FOR SUNDAY, OCT. 2 **California Minuteman volunteer Britt Craig rests in his hammock before going on patrol along the U.S.-Mexico Border in Campo, Calif., Aug. 4, 2005. The controversial group says it has been watching parts of the California Border since July 16 in an attempt to stem the flow of illegal immigration and possible terrorist suspects trying to get into the United States. (AP Photo/Sandy Huffaker)

Border Patrol agent Jeff Mielke secures plastic handcuffs on a group of suspected illegal immigrants caught in the Otay Mesa Mountain Range,near Dulzura, Calif., Oct. 12, 2005. Mielke is part of an elite Border Patrol unit that combs remote parts of the border that are inaccessible to vehicles.(AP Photo/Sandy Huffaker)

Gus Mendivil a welder/ironworker for Top Flite Construction, carries a handful of steel above a couple of vehicle bays on the new facilities maintenance building being erected at the Border Patrol station at Davis-Monthan Air Force Base, Tucson, Ariz., Thursday, Nov. 10, 2005. The U.S. Border Patrol is expanding its infrastructure in Southern Arizona. (AP Photo/Arizona Daily Star , Kelly Presnell) ** MANDATORY CREDIT MAGS OUT NO SALES **

**RETRANSMITTING TO CORRECT LOCATION TO ARIVACA, ARIZONA NOT SASABE, MEXICO ** The shadow of a U.S. Border Patrol agent casts below a group of migrants detained near Arivaca, Arizona, in this April 25, 2006 photo. Bush is expected to make a speech on how the United States should deal with border security and illegal immigrants already in the United States on Monday, May 15, 2006. (AP Photo/Gregory Bull)

U.S. Border Patrol Agent Carlos Galvan, second left, fingerprints illegal immigrants at a processing center in Nogales, Ariz., on Thursday, April 6, 2006. Senate Republicans and Democrats closed in on a last-minute compromise Thursday on legislation opening the way to legal status and eventual citizenship for many of the 11 million immigrants living in the United States illegally. (AP Photo/Khampha Bouaphanh)

A Border Patrol agent looks on as two women from the southern Mexican state of Oaxaca hold their things after being caught in the Arizona desert near Arivaca, bordering Mexico, Tuesday, April 25, 2006. A decade ago, women traditionally headed north to join their husbands. Now, more young, single and divorced women are risking the life-threatening journey, drawn by the need to support their children. (AP Photo/Gregory Bull)

Hermin Ramos of Oaxaca, Mexico, looks over the U.S.-Mexico border fence near Smuggler's Gulch west of the San Ysidro Port of Entry in San Diego, Thursday, April 27, 2006. The Senate voted Wednesday to divert some of the money President Bush requested for the war in Iraq to instead increase patrols against illegal immigrants on the nation's borders as well as border checkpoints and a fence along the Mexico border crossing near San Diego. (AP Photo/Denis Poroy)

U.S. Border Patrol Agent Al Martinez loads an illegal immigrant into a truck after apprehending him near the U.S./Mexico border in San Luis, Ariz. on Thursday, March 30, 2006. Arizona is in a tizzy over immigration, pressured by political crosswinds that reflect the national debate over how to control U.S. borders. (AP Photo/Khampha Bouaphanh)

This photo provided by the Border Patrol shows some of the 93 people found inside a so-called "drop house" and in a rear utility shed Thursday, March 30, 2006, in Yuma, Ariz. Many of the immigrants were women and children who said they had been in the house for two days. Agents described the inside of the home as garbage-strewn and sweltering, with all the window closed. (AP Photo/The Border Patrol)

** FILE ** A U.S. Border Patrol agent patrols along the fence line of the U.S.-Mexico border in Nogales, Ariz., on Thursday, April 6, 2006. (AP Photo/Khampha Bouaphanh)

Migrants cross the desert between Sasabe, Mexico, and Sasabe, Arizona Tuesday, April 25, 2006. As temperatures rise, the U.S. Border Patrol and aid groups are gearing up for what they fear could be one of the deadliest summers for migrants sneaking into the United States. (AP Photo/Gregory Bull)

Ulises Torres explores along the U.S.-Mexico border fence where it meets the Pacific Ocean in Imperial Beach, Calif., Thursday, April 27, 2006. Torres was fishing with his father at the Playas de Tijuana in Tijuana, Mexico. The Senate voted Wednesday to divert some of the money President Bush requested for the war in Iraq to instead increase patrols against illegal immigrants on the nation's borders as well as border checkpoints and a fence along the Mexico border crossing near San Diego. (AP Photo/Denis Poroy)

Wilberth Salmaron, 22, left, Daniel Gudino, 34, center, and Ricardo Alvarez, 33, help wash cooking pots after dinner at the Casa del Migrante, a shelter for migrants, on Wednesday, May 3, 2006, in Tijuana, Mexico. For lone migrants who cannot afford paying a smuggler and have to try on their own, the first stop is usually a shelter where they can find partners for their journey. They learn from other crossers which hills and canyons to take, the best time of day to cross, the places to avoid and where they might hide from the U.S. Border Patrol. (AP Photo/David Maung)

A man rests his hands on a fence looking out to the United States at a Mexican customs station after being detained by U.S. Border Patrol in Arizona and returned to Mexico in Nogales, Mexico, Thursday, May 19, 2006. President Bush is visiting the Arizona border Thursday, amid an increasingly emotional debate about immigration legislation. (AP Photo/Gregory Bull)

President Bush addresses an audience Thursday, May 18, 2006, at the Border Patrol sector headquarters in Yuma, Ariz. Bush was in Arizona trying to build support for his comprehensive immigration overhaul that would provide illegal immigrants a path to citizenship while also beefing up border security. (AP Photo/Matt York)

A group of men wait in the shadows at a Mexican customs station after being detained by the U.S. Border Patrol in Arizona and returned to Mexico in Nogales, Mexico, Thursday, May 18, 2006. President George Bush is visiting the Arizona border Thursday, amid an increasingly emotional debate about immigration legislation. (AP Photo/Gregory Bull)

A U.S. Border Patrol agent drives by a stretch of fence being built by the Minutemen along the U.S./Mexican border near Palominas, Ariz. on Saturday, May 27, 2006. Scores of volunteers gathered at a remote ranch Saturday to help a civilian border-patrol group start building a short security fence in hopes of reducing illegal immigration from Mexico. (AP Photo/Khampha Bouaphanh)

A U.S. Border Patrol Agent apprehends two undocumented aliens along the international border in Nogales, Ariz. Wednesday, May 31, 2006, as a group gathers along the fence in Nogales, Sonora, Mexico. (AP Photo/Matt York)

A group of undocumented migrants head back to the Mexico side of the U.S.- Mexico border after they were spotted by a U.S. Border Patrol agent while crossing the New River in Calexico, Calif., Monday, June 5, 2006. (AP Photo/Jae C. Hong)

Undocumented migrant, who refuse to identify himself, clings to the border as he checks on the U.S. Border Patrol from the Mexico side of the United States-Mexico border in Tijuana, Mexico, Monday, June 5, 2006. (AP Photo/Jae C. Hong)

** ADVANCE FOR MONDAY AUG. 7 ** Polaroid photographs of captured illegal immigrants adorn a wall at the U.S. Border Patrol station in Tecate, Calif., July 21, 2006. As border enforcement heightens in Arizona, more people are sneaking into the United States from Mexico near San Diego, a former hotspot. Nowhere is that shift more evident than in Tecate, a mountainous village about 25 miles east of San Diego.(AP Photo/Lenny Ignelzi)

U.S. Border Watch president Curtis Collier, right, Lance Williams, center, with the Texas Militia, and other civilian border watchers scout a ranch near Indio, Texas, Tuesday, Sept. 12, 2006. Collier's group joined forces with the Texas Minutemen and other civilian border watchers to begin patrolling the area. (AP Photo/Eric Gay)

U.S. Border Patrol Agents Amber Galloway, left, and Monique Grame of the mounted horse division, patrol the U.S.-Mexico border in Ocotillo, Calif., on Wednesday, Dec. 28, 2006.(AP Photo/Imperial Valley Press, Cuauhtemoc Beltran)

Tennessee National Guard Sgt 1st Class Andy Kelemer stands near the primary border fence area Friday, March 2, 2007, in Yuma, Ariz. Tennessee soldiers are currently deployed in Arizona as a part of Operation Jumpstart, working in support of Border Patrol efforts in Texas, Arizona, New Mexico and California. (AP Photo/John Partipilo, Pool)

Senior Patrol Agent Jim Johnston, of Spokane, WA. ,center, instructs new Border Patrol Agents on how to maneuver 4 x 4' s' at the Border Patrol Academy 4 x 4 training track Thursday, April 5, 2007 in Artesia, N.M. (AP Photo/Matt York)

** ADVANCE FOR SUNDAY, MAY 20 ** Border Patrol Agent recruits practice self defense drills at the Border Patrol Academy Thursday, April 5, 2007 in Artesia, NM. The Bush administration plans to strengthen border security by increasing the number of Border Patrol agents from about 12,000 last year to 18,000 by the end of 2008. (AP Photo/Matt York)

A group of migrants sit in a bus taking them to the border near the Mexican town of El Tortugo, on the border with Arizona, Wednesday, April 11, 2007. Mexican druglords, fighting back against increased U.S. border security, have seized control of coveted migrant-smuggling routes, collecting money and distracting National Guard and Border Patrol agents, Mexican and U.S. officials say. (AP Photo/Eduardo Verdugo)

A man waits to be processed at a Border Patrol detention center Wednesday, Jan. 11, 2012, in Imperial Beach, Calif. The Border Patrol is moving to end its revolving-door policy of turning migrants around to Mexico without any punishment in what amounted to an invitation to immediately try their luck again. (AP Photo/Gregory Bull)

ADVANCE FOR USE SUNDAY, JULY 31, 2011 AND THEREAFTER - In this Tuesday, Jan. 25, 2011 picture, Bill Newell, special agent in charge of ATF Phoenix, speaks behind a cache of seized weapons in Phoenix. The ATF is under fire over a Phoenix-based gun-trafficking investigation called "Fast and Furious," in which agents allowed hundreds of guns into the hands of straw purchasers in hopes of making a bigger case. Two of those weapons were found in December 2010 at the fatal shooting of an U.S. Border Patrol agent, igniting a scandal that has resulted in a congressional investigation and review by the Justice Department's Office of Inspector General. (AP Photo/Matt York)

FILE - In this April 19, 2011, file photo, a member of the National Guard checks on his colleague inside a Border Patrol Skybox near the Hidalgo International Bridge in Hidalgo, Texas. National Guard members along the Texas-Mexico border assist Border Patrol by surveying the terrain from the tower. All major Republican presidential candidates have promised to secure the U.S.-Mexico border. Many support a fence stretching nearly 2,000 miles to do so. But a border that is sealed to all illegal immigrants and drugs is a promise none of them could keep. (AP Photo/Delcia Lopez, File)

** ADVANCE FOR USE SUNDAY, MAY 8, 2011 AND THEREAFTER ** In this photo taken on April 27, 2011, state police officers patrol a highway between Ciudad Victoria and Matamoros, Mexico. A total of 183 bodies have been found in mass graves near San Fernando, most of them were presumably people kidnapped from buses traveling between Ciudad Victoria, capital of Tamaulipas state, and the border town of Matamoros, according to authorities. (AP Photo/Alexandre Meneghini)

President Barack Obama talks with Customs and Border Patrol officer Daniel Thomson during his tour of the Bridge of America Cargo Facility in El Paso, Texas, Tuesday, May 10, 2011. (AP Photo/Charles Dharapak)

Gabriel Ramirez, a co-worker of U.S. Border Patrol Agent Eduardo Rojas Jr., shares a few stories about his fallen friend during the memorial service, Friday, May 20, 2011, in Yuma, Ariz. The service was for Rojas and Hector Clark, two Border Patrol agents who were killed in the line of duty May 12. (AP Photo/Yuma Sun, Jared Dort)