President Donald Trump’s administration’s response to a judicial request for more details on timing of deportation flights carrying hundreds of Venezuelan migrants was “woefully insufficient,” a judge said on Thursday, accusing officials of evading their responsibilities under an order he issued.

Washington-based U.S. District Judge James Boasberg is weighing whether administration officials violated his March 15 order intended to temporarily block the expulsions. In a new order on Thursday, the judge told Justice Department officials to explain by next Tuesday why the administration’s failure to bring the deported migrants back to the United States did not violate his order.

Boasberg’s order on Thursday escalates his dispute with the administration that has raised concerns among Trump critics and some legal experts about a potentially looming constitutional crisis if the administration defies judicial decisions.