Trump is expected to invoke the Alien Enemies Act as part of the efforts to carry out mass deportations, according to two U.S. officials familiar with the matter.

The Alien Enemies Act is part of the four Alien and Sedition Acts of 1798, which Congress passed as the U.S. stood on the brink of war with France.

Experts predict a swift legal challenge to Trump's 'novel' approach of invoking wartime powers to target immigration.

The act is a wartime authority that allows the president to detain and deport non-U.S. citizens from enemy countries.

Authorities plan to mainly target members of Tren de Aragua, a violent Venezuelan gang.