Interior Immigration Enforcement: Criminal Alien Programs. Congressional Research Service, Library of Congress. William A. Kandel. September 8, 2016.
Congress has long supported efforts to identify, detain, and remove criminal aliens, defined as noncitizens who have been convicted of crimes in the United States. The apprehension and expeditious removal of criminal aliens has been a statutory priority since 1986, and the Department of Homeland Security (DHS) and one of its predecessor agencies have operated programs targeting criminal aliens since 1988. Investments in DHS’s Immigration and Customs Enforcement (ICE) interior enforcement programs since 2004 have increased the number of potentially removable aliens identified within the United States.
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