The Trump administration said Sunday that hundreds of individuals were deported from the country after President Donald Trump invoked the Alien Enemies Act, a sweeping wartime authority which has been used only three times before,

President Trump says he’s using the 227-year-old law to crack down on Venezuela’s Tren de Aragua gang. The move is already facing a legal challenge. Here’s a look at key questions and answers about the Alien Enemies Act.

President Donald Trump has invoked the Alien Enemies Act for the first time since World War II, granting himself sweeping powers under a centuries-old law to deport people associated with a Venezuelan gang.