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A group of Mexican migrants-to-be cross 01 March 2006 the wire fence by a road 40 km away Nuevo Laredo, Tamaulipas state, Mexico, to go into the desert, then to walk four hours until reaching the Rio Bravo, to cross illegaly to the United States. AFP PHOTO/Omar TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

A group of Mexican migrants-to-be cross 01 March 2006 the wire fence by a road 40 km away Nuevo Laredo, Tamaulipas state, Mexico, to go into the desert, then to walk four hours until reaching the Rio Bravo, to cross illegaly to the United States. AFP PHOTO/Omar TORRES        (Photo credit should read OMAR TORRES/AFP/Getty Images)