The ruling, applying only to detainees held in western Pennsylvania, is the first to uphold the president’s invocation of the wartime act. But it requires that detainees be given 21 days’ notice.

Trump issued a proclamation in March claiming that Tren de Aragua was invading the U.S. A federal judge says President Donald Trump can use the Alien Enemies Act to deport Venezuelan citizens who are shown to be members of the Tren de Aragua gang.