Why not? Illegals haven’t renounced allegiance to their home countries or sworn to the US as immigrants are required to do and thus can’t be prosecuted for treason, they can’t be drafted into the military or compelled to sit on a jury or perform other duties of citizens, etc. They are legally alien to the US.The specific argument here is that the phrase "subject to the jurisdiction thereof" would exclude illegal immigrants. But that interpretation would imply that illegals are not subject to US law, which wouldn't make sense.
https://www.nationalreview.com/2015/...4th-amendment/