The court fight focuses on the Trump administration's use of a 1798 law to deport people it claims are part of the Venezuelan gang Tren de Aragua.

In 1798, with the U.S. preparing for what it believed would be a war with France, Congress passed a series of laws that increased the federal government’s reach. The Alien Enemies Act was created to give the president wide powers to imprison and deport noncitizens in time of war.