El Salvador has agreed to house violent US criminals and receive deportees of any nationality, US Secretary of State Marco Rubio announced Monday, in an unprecedented – and legally problematic deal – that has alarmed critics and rights groups.

U.S. Secretary of State Marco Rubio says El Salvador's president has offered to accept deportees from the U.S. of any nationality, including Americans.

El Salvador has agreed to take deportees from the United States and violent criminals from U.S. prisons in an "extraordinary migratory agreement," which Secretary of State Marco Rubio announced Monday.