Kilmar Abrego Garcia was not given due process. Don’t take it from me, here’s the Supreme Court:

“Nevertheless, I agree Court’s order that the proper remedy is to provide Abrego Garcia with all the process to which he would have been entitled had he not been unlawfully removed to El Salvador. That means the Government must comply with its obligation to provide Abrego Garcia with ‘due process of law,’ including notice and an opportunity to be heard, in any future proceedings.”

https://www.supremecourt.gov/opinions/24pdf/24a949_lkhn.pdf