It’s a local threat to some and a full-on invasion to President Donald Trump. Debates over Trump’s hardline migration policies are focused on the ruthless Venezuelan gang Tren de Aragua. Trump labeled the Tren de Aragua an invading force when he invoked the Alien Enemies Act, a 1798 authority that allows the president to deport any noncitizen during wartime. The Trump administration transferred hundreds of immigrants to El Salvador over the weekend even as a federal judge issued an order temporarily barring the deportations. Flights were in the air when the judge issued his ruling.