The Fake News is so fake. Just now listening to the ABC radio news report at the top of the hour and the reporter authoritatively reports, as if slam-dunk countering Trump’s plan as she just reported, states that the Constitution states...minus the “subject to the jurisdiction thereof” phrase.
BTW Rep Steve King has a good page online about the amendment: https://steveking.house.gov/media-center/columns/ending-birthright-citizenship-does-not-require-a-constitutional-amendment
If nothing else, POTUS will get the issue before the U.S. Supreme Court and that’s a good thing. It needs to be. Plus, he’s going to educate a ton of Americans on the issue in the meantime.