Administration officials said they expect the fight over using the wartime act to ultimately head to the Supreme Court.

ACLU lawyers want answers from the federal government about its deportation actions over the weekend. A judge ordered a hearing for Monday afternoon.

More than half of the 261 immigrants expelled to El Salvador on Saturday were swept out of the United States using a wartime powers act, a White House official said Sunday, amid questions about whether the Trump administration flouted a judge’s order barring use of the statute to hasten deportations.