Explainer-What is the Alien Enemies Act of 1798 that Trump wants to use in deportations?

U.S. President Donald Trump said he planned to invoke the Alien Enemies Act as part of his pledge to deport millions of people who are in the country illegally. The Alien Enemies Act was enacted in 1798 to combat spying and sabotage during tensions with France. It authorizes the president to deport, detain or place restrictions on individuals whose primary allegiance is to a foreign power and who might pose a national security risk in wartime.