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U.S. Customs and Border Patrol agents patrol on their ATVs at night along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents patrol on ATVs at dusk along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents patrol after dusk along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agent Manny Villalobos suits up for his night patrol along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents sit on the ATVs atop a hill overlooking Tijuana, Mexico during their night patrol along the international border between Mexico and the United States, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

The moon rises above a U.S. Customs and Border Patrol agent as he patrols along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents patrol at night while riding ATVs along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents patrol next to the secondary fence along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agent David Faatoalia wears a radio on his chest as he patrols along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents Jarrod Yackel, Manny Villalobos, and David Faatoalia patrol on ATVs at dusk along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

The primary fence is shown at night along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

A U.S. Customs and Border Patrol agent waits at the top of a hill overlooking Imperial Beach, California, during his patrol along the international border between Mexico and the United States, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agent Manny Villalobos (C) patrols with other agents along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents sit on their ATVs atop a hill overlooking Tijuana, Mexico during a night patrol along the international border between Mexico and the United States, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

A patch is shown on the uniform of a U.S. Customs and Border Patrol agent near the international border between Mexico and the United States south of San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

The moon rises along the primary fence between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents patrol east of the Pacific Ocean along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents patrol along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agents patrol along the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

U.S. Customs and Border Patrol agent David Faatoalia looks out over the international border between Mexico and the United States during his patrol near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )

A U.S. Customs and Border Patrol agent patrols on his ATV along the primary fence on the international border between Mexico and the United States near San Diego, California, March 26, 2013. Picture taken March 26, 2013. REUTERS/Mike Blake ( USA-BORDER/ )