NOGALES, AZ - JUNE 18: Boys await medical appointments in a holding area where hundreds of mostly Central American immigrant children are being processed and held at the U.S. Customs and Border Protection Nogales Placement Center on June 18, 2014, in Nogales, Arizona. Brownsville, Texas, and Nogales, have been central to processing the more than 47,000 unaccompanied children who have entered the country illegally since Oct. 1. (Photo by Ross D. Franklin-Pool/Getty Images)
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