MORE: 2nd judge rules Trump's use of Alien Enemies Act for deportations is unlawful. In the multiple lawsuits the ACLU has helped bring against Trump's use of the AEA, the group h

The U.S. Court of Appeals for the 5th Circuit is considering whether the president properly invoked the Alien Enemies Act to deport alleged gang members.

The case before one of the most conservative courts in the country is likely to be the first to reach the Supreme Court.