If that were true (which it isn't), when you don't get due process, they can just claim you aren't a citizen, and then—just as they have—'deport' (read: exile)

If that were true (which it isn't), when you don't get due process, they can just claim you aren't a citizen, and then—just as they have—'deport' (read: exile) you and claim there is no way to get you back when the "mistake" is found.