It's nothing. It's completely outside the criminal justice system. It's not even a misdemeanor.

Without a current visa of some kind though, you are deportable, mostly at the whims and mercy of the government. But you wouldn't be committing a crime and deportation is not a criminal punishment.

When you do crimes, you get criminally punished (hypothetically) citizen or not (jail, fines, etc).

Whether the government can, should or must carry out a deportation are all truly separate considerations, often with distinct, case-by-case answers.

And with all this in mind, pause for a moment and sit with the fact that thousands of people who have committed no crime at all are getting grabbed off the street and incarcerated indefinitely by ICE and subjected to ghastly conditions