One of ICE's central responsibilities is to enforce the nation's civil immigration laws in coordination with U.S. Customs and Border Protection (CBP) and U.S. Citizenship and Immigration Services (USCIS). ICE, however, has limited resources to remove those illegally in the United States.ICE must prioritize the use of its enforcement personnel, detention space, and removal assets to ensure that the aliens it removes represent, as much as reasonably possible, the agency's enforcement priorities, namely the promotion of national security, border security, public safety, and the integrity of the immigration system. These priorities are outlined in the ICE Civil Immigration Enforcement Priorities memorandum of March 2,2011, which this memorandum is intended to support.