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In this Sept. 10, 2014 photo, Irma Ortiz applies makeup while waiting in line to cross into the United States from Tijuana, Mexico. Ortiz lives in Tijuana and works in San Diego, crossing the border almost daily. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nationâs busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)![San_Diego_border__16_]()
In this June 7, 2001 handout file photo provided by Immigration and Naturalization Services, Enrique Aguilar Canchola, a 42-year-old Mexican national, hides in the seat of a vehicle, that according to government officials, was being used to smuggle him into the United States from Mexico at the San Ysidro port of entry in San Diego. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Immigration and Naturalization Services)![San_Diego_border__13_]()
FILE - In this June 13, 2013 file photo, hands from Daniel Zambrano of Tijuana, Mexico, hold on to the bars that make up the border wall separating the U.S. and Mexico as the border meets the Pacific Ocean in San Diego. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)![San_Diego_border__1_]()
FILE - In this Aug. 8, 1996 file photo, a sign warns motorists of the possibility of undocumented immigrants crossing the freeway near the border in San Diego. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Damian Dovarganes)![San_Diego_border__3_]()
The future arena for Olympic handball is built in Rio de Janeiro, Brazil, Wednesday, Aug. 5, 2015. Rio de Janeiro Mayor Eduardo Paes said on Wednesday all the venues for South America's first games are on track to be ready when the curtain comes up on Aug. 5 next year. (AP Photo/Leo Correa)![San_Diego_border__17_]()
FILE - In this Oct. 5, 1998 file photo, men look over the border wall from Tijuana, Mexico, towards San Diego. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Lenny Ignelzi)![San_Diego_border__10_]()
FILE - In this Nov. 19, 2014, file photo, Javier Montes waits in line for a meal at the Padre Chava migrant shelter after being deported back to Tijuana, Mexico from California. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)![San_Diego_border__6_]()
FILE - In this Dec. 3, 2014 file picture, Rene Peralta, 46, waits in his car to enter the United States from Tijuana, Mexico through the San Ysidro port of entry. Long lines disappeared overnight for tens of thousands of motorists who regularly enter the country at the nations busiest border crossing, after a $741 million makeover. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)![San_Diego_border__7_]()
In this Nov. 15, 2013 file photo, Tijuana-based tour guide Derrik Chinn, right, leads Michael Beverly and his wife Amanda, both of Newfoundland, Canada, on an evening walk along the Mexican side of the border as floodlights beam through the border structure from the United States side, in Tijuana, Mexico. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)![San_Diego_border__11_]()
In this Nov. 15, 2013 file photo, Amanda Beverly, of Newfoundland, Canada, looks over souvenirs in Tijuana, Mexico. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)![San_Diego_border__8_]()
In this Nov. 15, 2013 file photo, Tijuana-based tour guide Derrik Chinn, right, leads Michael Beverly and his wife Amanda, both of Newfoundland, Canada, on an evening walk along the Mexican side of the border as floodlights beam through the border structure from the United States side, in Tijuana, Mexico. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)![San_Diego_border__12_]()
In this Sept. 10, 2014 file photo, Johann Rodriguez caresses her three month-old son Lionel as he falls asleep after nursing while waiting in line at the Western Hemisphere's busiest border crossing in Tijuana, Mexico. Rodriguez crosses the border most days to work in the United States. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)![San_Diego_border__14_]()
FILE - In this March 9, 2009 file photo, Mexican Federal police take a suspect into custody in connection with a shooting in Tijuana, Mexico. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Guillermo Arias)![San_Diego_border__15_]()
FILE - In this Sept. 11, 2008 file photo, a man climbs the border wall to cross into the United States from Tijuana, Mexico. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nations busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Guillermo Arias)![San_Diego_border__2_]()
FILE - In this May 3, 1988 file photo, an unidentified man voluntarily gives himself up to U.S. Border Patrol agent Stuart Kutz near the border in San Diego. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nationâs busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Jimmy Dorantes)![San_Diego_border__4_]()
FILE - In this Oct. 14, 1991 file photo, men jump the border wall, crossing from Tijuana, Mexico, into San Diego. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nationâs busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Lenny Ignelzi)![San_Diego_border__5_]()
FILE - In this Dec. 3, 2014 file photo, cars wait to enter the United States from Tijuana, Mexico through the San Ysidro port of entry in San Diego. Long lines disappeared overnight for tens of thousands of motorists who regularly enter the country at the nationâs busiest border crossing, after a $741 million makeover. To many Republican presidential contenders in Thursday, Aug. 8, 2015 debate, the U.S. border with Mexico must be secured for millions in the country illegally to stay. To many commuters at the nationâs busiest crossing, their border already is secure - even thriving by historical standards. (AP Photo/Gregory Bull)Scenes from busiest U.S-Mexico border crossing: San Diego
A sign that greets motorists entering the U.S. at the nation's busiest border crossing shows a silhouette of a man, woman and pigtailed girl running for their lives under the word "Caution."
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- Scenes from busiest U.S-Mexico border crossing: San Diego
