In this June 18, 2014, pool file photo, detainees walk in a line at a U.S. Customs and Border Protection processing facility in Brownsville, Texas.
In this June 18, 2014, pool file photo, detainees walk in a line at a U.S. Customs and Border Protection processing facility in Brownsville, Texas. Eric Gay Associated Press
In this June 18, 2014, pool file photo, detainees walk in a line at a U.S. Customs and Border Protection processing facility in Brownsville, Texas. Eric Gay Associated Press