The DOJ lawyer was engaged "to zealously advocate” for DHS 's decision to deport Abrego. He was wholy unprepared and could not answer why Abrego was determined (by 2 other judges) to be MS-13.
He was not up to the job and was fired
https://timesofindia.indiatimes.com/world/us/who-is-erez-reuveni-doj-official-put-on-leave-after-failing-to-defend-deportation-case/articleshow/120044824.cms