A federal judge examining the Trump administration’s use of an 18th-century wartime law to deport Venezuelan immigrants to El Salvador vowed Friday to “get to the bottom” of whether the government defied his order to turn the planes around.

The judge overseeing the case gave the Trump administration a March 25 deadline to decide whether it would invoke the privilege.

A federal judge chastised a Justice Department attorney Friday, expressing doubt about the legality of the Trump administration’s use of the Alien Enemies Act. U.S. District Judge James