If the accusation is as simple as "you don't have a right to be in the country" what makes proving it different from a real trial?

> From everything I've been able to gather on this story, the issue isn't really whether he should have been deported, it's that there was a legal order preventing him from being deported to the country of El Salvador specifically because a rival gang in the country would kill him for being a member of MS-13.

If there's only one place you could reasonably be deported to, and there's an order saying you can't be deported there, then you can't be deported and you effectively have legal residency.