FILE - In this May 18, 2006 file photo, a man rests his hands on a fence looking out to the United States from a Mexican customs station after being detained by U.S. Border Patrol in Arizona and returned to Mexico in Nogales, Mexico. The border near Nogales is consider the nation's busiest illegal corridor. (AP Photo/Gregory Bull)

Associated Press
FILE - In this May 18, 2006 file photo, a man rests his hands on a fence looking out to the United States from a Mexican customs station after being detained by U.S. Border Patrol in Arizona and returned to Mexico in Nogales, Mexico. The border near Nogales is consider the nation's busiest illegal corridor. (AP Photo/Gregory Bull)
FILE - In this May 18, 2006 file photo, a man rests his hands on a fence looking out to the United States from a Mexican customs station after being detained by U.S. Border Patrol in Arizona and returned to Mexico in Nogales, Mexico. The border near Nogales is consider the nation's busiest illegal corridor. (AP Photo/Gregory Bull)
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