ALTAR, MEXICO JAN. 29, 2007-- A group of migrants walk north, Monday Jan. 29, 2007, cross the desert in Sonora, Mexico heading to the United States. ---DENVER POST PHOTO BY RJ SANGOSTI [Getty Images]

ALTAR, MEXICO JAN. 29, 2007-- A group of migrants walk north, Monday Jan. 29, 2007, cross the desert in Sonora, Mexico heading to the United States. ---DENVER POST PHOTO BY RJ SANGOSTI (Photo By RJ Sangosti/The Denver Post via Getty Images) — see more

ALTAR, MEXICO JAN. 29, 2007-- A group of migrants walk north, Monday Jan. 29, 2007, cross the desert in Sonora, Mexico heading to the United States. ---DENVER POST PHOTO BY RJ SANGOSTI (Photo By RJ Sangosti/The Denver Post via Getty Images)

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