It isn't legal. Deportation is a civil process. Kinda like, 'We have the right to refuse anyone". Or like eviction.

[LeftInTX]

It isn't the same as "We have the right to refuse anyone and then force you go to x,y,z bar".

Of course deportation is more complicated. However, it is civil process and in Abrego's case, it is illegal to send him to El Salvador. So they should find a similar country such as Costa Rico (which has agreed to accept him) or Mexico and send him on his way. Civil processes are just that and the parties come to consensus.

Unfortunately, if Abrego is found guilty, he can be deported to El Salvador, since the guilty verdict would erase the 2019 removal hold.