President Donald Trump said the US is "at war" while responding to a question about his invocation of the Alien Enemies Act of 1798. He asserted Biden let "millions" of "criminals" into the US. The Aliens Enemies Act allows the president to order the detention and deportation of natives or citizens of an "enemy" nation without following the usual processes. This is the first time the Alien Enemies Act has been invoked since World War II.