The Biden administration has designated the Venezuelan migrant gang Tren de Aragua as a transnational criminal organization following requests from Republicans who say the group’s members have penetrated the southern border.

The Treasury Department’s Office of Foreign Assets Control announced Thursday that it had sanctioned Tren de Aragua, a cross-border crime ring that has been cited in connection to brutal crimes against U.S. citizens by illegal immigrants released at the border into the country under President Joe Biden’s administration.