President Donald Trump declared on Saturday that the United States is being invaded by the Venezuela-based gang Tren de Aragua and ordered for the deportation of all members of the gang who are residing in the country illegally.

Tren de Aragua (Train of Aragua, or Aragua Train) has roots in Tocorón prison in Venezuela’s northern Aragua state, which the group’s leaders had transformed into a mini-city with a pool, restaurants and a zoo.

The order specifies that any Venezuelan citizen aged 14 or older who is a gang member, residing in the U.S. without naturalization or lawful permanent resident status, is “liable to be apprehended, restrained, secured, and removed as Alien Enemies.”