A Donald Trump-appointed federal judge in Texas ruled that the president unlawfully invoked the Alien Enemies Act and blocked the administration from quickly deporting some alleged members of a Venezuelan gang.

Judge Fernando Rodriguez, a Trump appointee, said the Alien Enemies Act was not an option to deport Venezuelan migrants detained in southern Texas.

The ruling, which is limited to the Southern District of Texas, prohibited the administration from using the wartime law because the president’s claims about a Venezuelan gang do not add up to an “invasion.