Immigration parole is a form of temporary permission under American law to be in the country for "urgent humanitarian reasons or significant public benefit," allowing recipients to live and work in the United States. Biden, a Democrat, used parole as part of his administration's approach by to deter illegal immigration at the U.S.-Mexican border.
Trump called for ending humanitarian parole programs in an executive order signed on January 20, his first day back in office. The Department of Homeland Security subsequently moved to terminate them in March, cutting short the two-year parole grants. The administration said revoking the parole status would make it easier to place migrants in a fast-track deportation process called "expedited removal."
The case is one of many that Trump's administration has brought in an emergency fashion to the nation's highest judicial body seeking to undo decisions by judges impeding his sweeping policies, including several targeting immigrants.