Immigration advocacy groups are suing the Trump administration, saying they are illegally shutting down asylum access at the southern border and putting people fleeing war and persecution in harm’s way.

A leading U.S. civil rights group accused President Donald Trump on Monday of violating U.S. laws and international treaties with his sweeping ban on asylum at the U.S.-Mexico border.

The American Civil Liberties Union, along with immigration legal aid groups, Monday filed the first major lawsuit against the Trump administration’s proclamation of an “invasion” at the southern border to justify expelling migrants and preventing them from claiming asylum.