**FILE** Illegal immigrants prepare to enter a bus after being processed at the U.S. Border Patrol's Tucson Sector headquarters on Aug. 9, 2012, in Tucson, Ariz. (Associated Press)

Photo by: Ross D. Franklin

**FILE** Illegal immigrants prepare to enter a bus after being processed at the U.S. Border Patrol's Tucson Sector headquarters on Aug. 9, 2012, in Tucson, Ariz. (Associated Press)