A federal appeals court in Washington is set to hear arguments Friday about the legality of the Trump administration’s decision to wind down the Deferred Action for Childhood Arrivals program.

A panel of judges for the U.S. Court of Appeals for the D.C. Circuit will weigh the lawfulness of the September 2017 decision to rescind the Obama-era immigration program, which defers deportation for hundreds of thousands of undocumented immigrants who arrived in the United States as children. U.S. District Judge John Bates of the District of Columbia ruled last year that the rescission was an unlawful violation of the Administrative Procedure Act, calling it “arbitrary and capricious.”