Elected last year on a promise to crack down on migrants, Trump invoked the 1798 Alien Enemies Act in an attempt to swiftly deport accused members of Tren de Aragua, a criminal gang originating from Venezuelan prisons that his administration labels a terrorist group.

The Supreme Court early Saturday halted the administration’s ability to use the Alien Enemies Act to swiftly deport migrants to El Salvador who are being detained in portions of Texas, for now.

The early-morning order temporarily blocks the administration’s attempt to use the Alien Enemies Act to remove a group of Venezuelan migrants.