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.

El Salvador has agreed to accept criminal illegal immigrants of any nationality as the United States works to deport hundreds of Venezuelan Tren de Aragua gang members. The agreement, announced by Salvadoran President Nayib Bukele‘s administration late Monday,

It could give the Trump administration a destination to send thousands of Venezuelan migrants whom Caracas won’t take back.