Less than two weeks after the Supreme Court allowed President Donald Trump to use a controversial 18th century wartime authority to speed deportations, the issue has rocketed back to the justices in a second short-fuse appeal with enormous potential consequences.

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

High court acted in an emergency appeal from the American Civil Liberties Union contending that immigration authorities appeared to be moving to restart removals under the Alien Enemies Act of 1798.