His mistaken deportation became a flashpoint in tensions over the Trump Administration’s hardline immigration policy.

At the notorious CECOT prison, he was forced to frog-march, had to kneel from 9 p.m. to 6 a.m. and was subjected to beatings and threats, his lawyers said Wednesday.

Kilmar Abrego Garcia, who was returned to the U.S. last month, said he suffered severe beatings and psychological torture during his time in then notorious El Salvador prison after being deported in March.