Actually, no court has ever ruled in favor of "birthright citizenship" as it applies to an illegal alien.
It is thought that the State Department somehow started the trend.
Wong Kim Ark, recall, did not apply to illegal aliens. The parents were clearly U.S. citizens.
Actually, I think they were legal residents at the time, not citizens. I’ve not had anyone explain why we would have more jurisdiction over a legal alien than an illegal one. Are there some laws we can enforce against legal aliens that we can’t enforce against illegals just because they are illegal?