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The U.S. Border Patrol cruises the fence Wednesday, May 12, 1999, separating the U.S. from Mexico along the Tijuana River Valley where a new waste treatment plant has been built as part of a joint venture between the two countries to control pollution. A three day conference involving the EPA and Mexican officals is currently taking place in Ensenada, Mexico. (AP Photo/Lenny Ignelzi) ( BORDER ENVIRONMENT )

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) ( ELUDING GATEKEEPER )

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) ( BORDER TECHNOLOGY )

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) ( BORDER DRUGS )

U.S. Customs Service inspectors open the trunk of a car carrying five suspected illegal immigrants at the San Ysidro Port of Entry on Wednesday, Sept. 20, 2000 in San Diego. The supected smuggler driving the car crashed into a pole while trying to evade authorities after running the border from Mexico. Smugglers are trying more frequently to use cars to bring illegal immigrants into the United States because of increased efforts by the U.S Border Patrol to stop illegal crossings on foot. The five were taken into custody. (AP Photo/Denis Poroy) ( BORDER SMUGGLING )

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) ( US MEXICO MIGRANTS )

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 PROTEST )

Children hold hands while walking home from church in the border town of Los Pozos, Mexico, Sept. 2, 2001. (AP Photo/Gregory Bull) ( LIVING ON THE LINE )

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) ( MEXICO MIGRATION )

A U.S. Border Patrol vehicle goes down a steep road along the the U.S./Mexico border above Smuggler's Gulch in Imperial Beach, Calif., Oct. 14, 2003. The federal government and a powerful local Republican congressman have been pushing for years to fortify the 3 1/2-mile stretch of border just north of Tijuana. Their plan is opposed by California coastal regulators and environmentalists who say it could harm a fragile Pacific estuary. Now supporters may be getting closer to victory. (AP Photo/Denis Poroy, File) ( BORDER FENCE )

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, January 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) ( US MEXICO IMMIGRATION )

Marchers carry a casket along a section of the U.S.-Mexico border fence in Tijuana, Mexico Friday, Oct. 1, 2004, to mark the 10th anniversary of the U.S. border enforcement program Operation Gatekeeper. Immigrants rights groups blame the program for immigrant deaths because the active enforcement in the Tijuana area drives illegal immigrants to try to cross the border in the rougher terrain to the east. The U.S. Border Patrol maintains that increased vigilance and other efforts have helped reduce deaths among illegal immigrants crossing the border. Migrants-rights groups contend the agency has tried to shave its count by excluding from its total many skeletal remains, car-accident victims and bodies discovered by local law enforcement agencies. (AP Photo/Denis Poroy, File) ( COUNTING THE DEAD )

In this photo made Thursday, Aug. 6, 2009, rain clouds move in over the new U.S. Border Patrol facilities that include immigrant processing and agent housing near Hermanas, New Mexico. The U.S. Border Patrol has set up a permanent base in a remote section of the New Mexico desert so they can patrol the heavily trafficked region more than once a day. (AP Photo/LM Otero) ( Border Outpost )

In this March 17, 2009 file photo, Mexican soldiers patrol the streets of Reynosa, on Mexico's northeastern border with the United States. On March 10, 2013, heavy gunfire echoed along the main thoroughfare and across several neighborhoods in a firefight that lasted for hours, leaving perforated and burned vehicles scattered across the border city. Social media exploded with reports of dozens dead. Witnesses saw at least 12, but an official count showed only a couple of deaths. (AP Photo/Alexandre Meneghini, File) ( Mexico Drug War No Bodies )

In this June 8, 2011, file photo U.S. Customs and Border Patrol and Texas Department of Public Safety seize 57 bundles of marijuana weighing more than 1,200 pound at the Texas border along the Rio Grande in Abram, Texas. Most illegal border crossers are apprehended along the 2,000-mile long Mexican border in California, Arizona, New Mexico, and Texas. In the budget year that ended in September, 18,506 agents on that border made a combined 327,577 apprehensions, an average of nearly 18 apprehensions per agent, and spent about $283 million on overtime an according to Associated Press analysis of agency records. (AP Photo/Eric Gay, File) ( Border Patrol Overtime )

In this photo provided by the U.S. Customs and Border Protection, a silver Jeep Cherokee that suspected smugglers were attempting to drive over the U.S.-Mexico border fence is stuck at the top of a makeshift ramp early Wednesday, Oct. 31, 2012 near Yuma, Ariz. U.S. Border Patrol agents from the Yuma Station seized both the ramps and the vehicle, which stalled at the top of the ramp after it became high centered. The fence is approximately 14 feet high where the would-be smugglers attempted to illegally drive across the border. The two suspects fled into Mexico when the agents arrived at the scene. (AP Photo/U.S. Customs and Border Protection) ( Border Smuggling Ramp )

In this Friday, Aug. 10, 2012 photo, rancher Dan Bell checks out part of the property that he leases at the border fence between the United States and Mexico, in Nogales, Ariz. When Bell drives through the property, he speaks of the hurdles that the Border Patrol faces in his rolling green hills of oak and mesquite trees: The hours it takes to drive to some places, the wilderness areas that are generally off-limits to motorized vehicles, and the environmental reviews required to extend a dirt road. (AP Photo/Ross D. Franklin) ( Border Remote Lands )

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) ( Border Patrol Zero Tolerance )

American citizen Lace Rodriguez looks back into Mexico while walking back to the U.S. border after visiting her husband Javier Guerrero on March 10, 2013 in Nogales, Mexico. The family lived together in Phoenix before Guerrero, an undocumented worker from Mexico, said he was detained by the U.S. Border Patrol, held for three months by ICE and then deported March 4 to Nogales, Mexico. Guerrero had lived in the United States for 17 years. He and Rodriguez, a medical student, have two children, and she is nine-months pregnant with a third. The splitting up of families has become a major issue as the U.S. works towards immigration reform. (Photo by John Moore/Getty Images) ( 163479694 )