It remains unclear whether the Trump administration will apply the law in this way. But such an interpretation, experts say, would infringe on basic civil liberties.

Federal agents will soon be allowed to enter homes without a warrant, the president’s lawyers have argued, thanks to an 18th Century law recently used to deport Venezuelan gang members. The Alien Enemies Act of 1798,

The president has drawn criticism for invoking the Alien Enemies Act of 1798, a widely condemned law that makes it easier to detain foreign citizens

U.S. District Judge James Boasberg issued an order Saturday blocking the deportations, but lawyers told him there were already two planes with immigrants

A federal judge blocked the Trump administration from removing any migrants under the Alien Enemies Act late Saturday—but the White House said Sunday that hundreds of alleged gang members had still been sent to El Salvador.

Mr. Trump rejected the idea that Elon Musk was going to be told about secret U.S. plans for a potential military conflict with China, even as he denied reporting that such a briefing had been planned to be held at the Pentagon.