It happens to be the case that he's not a citizen or claiming to be a citizen, but he wasn't given due process, and there's absolutely nothing stopping them from picking anybody up off the street, claiming they're here illegally, and shipping them off to an El Salvadoran prison.
All people in the us, legal or illegal, citizen or not, have fourth amendment protections, and if you strip those rights from anyone, you remove them from everyone.
All people in the us, legal or illegal, citizen or not, have fourth amendment protections, and if you strip those rights from anyone, you remove them from everyone.