A federal judge has barred the administration of President Donald Trump from deportations under an 18th century law that Trump invoked just hours earlier asserting the United States was being invaded by a Venezuelan gang and that he had new powers to remove its members from the country.

Claiming the United States was being invaded by a Venezuelan gang, President Donald Trump on Saturday invoked the Alien Enemies Act of 1798, a sweeping wartime authority that allows the president broader leeway on policy and executive action to speed up mass deportations of people — potentially pushing his promised crackdown on immigration into higher gear.

The Trump administration immediately appealed the restraining order, warning it could set a dangerous precedent.