"Plaintiff Abrego Garcia reports that he was subjected to severe mistreatment upon arrival at CECOT, including but not limited to severe beatings, severe sleep deprivation, inadequate nutrition, and psychological torture," his lawyers said in the filing, adding he lost 31 pounds in his first two weeks there.

Kilmar Abrego Garcia says he suffered severe beatings, severe sleep deprivation and psychological torture in the notorious El Salvador prison the Trump administration had deported him to in March, according to court documents filed Wednesday.