Donald Trump's administration has used the "catch and release" program to free 461 undocumented immigrants from custody since he took office, partly because of limited detention space in U.S. immigration facilities,

ICE has take a spotlight role in the wake of plans in Trump's administration for mass deportations. Here's what you need to know about the agency.

Most of the ICE arrests were for nonviolent offenses. Those in custody face deportation or hearings before immigration judges.