FILE - In this Aug. 9, 2012, file photo, people are detained for being in the country illegally and are transferred out of the holding area after being processed at the Tucson Sector of the U.S. Customs and Border Protection headquarters in Tucson, Ariz. The number of immigrants in the U.S. illegally has changed little since the Great Recession began, dropping to 11.1 million in 2014 from 11.2 million in 2012 and 11.3 million in 2009, according to a study released Tuesday, Sept. 20, 2016, by the Pew Research Center. (AP Photo/Ross D. Franklin, File)

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