The Trump administration is appealing efforts by two judges to investigate whether government officials defied their rulings over the deportation of migrants to El Salvador, escalating a confrontation between the executive and judicial branches.

A federal judge on Friday said he cannot stop deportations under the Alien Enemies Act, although the Supreme Court has halted deportations for now. U.S. District Court Judge James Boasberg said he could not grant the American Civil Liberties Union an emergency order it wanted to stop deportations.

The Trump administration is ignoring court orders to bring back a Maryland man sent in error to a Salvadoran prison. Courts' ability to enforce the orders is being directly tested.