The federal judge overseeing the case of Kilmar Abrego Garcia appeared extremely frustrated Friday by the Trump administration’s efforts to thwart a search for answers on what officials are doing to facilitate his return from El Salvador.

Kilmar Abrego Garcia was deported to El Salvador in March in what the Trump administration admits was a mistake. His family has sued to get him back.

U.S. District Judge Paula Xinis said the government’s refusal to provide certain information in the case has been “an exercise in utter frustration.”