You are having difficulty following my argument and I’m sure that is partly my fault. Let me try to get there a different way: A Saudi Ambassador knocks up an American girl on US soil, what sort of citizenship will the child be born with?
A Saudi Ambassador knocks up an American girl on US soil, what sort of citizenship will the child be born with?Where he knocks her up is irrelevant. If the child is born on American soil, then the child will be be a Natural Born citizen based on "US v Wong Kim Ark". Wong Kim Ark was determined to be a natural born citizen (not needing naturalization) even though he had TWO parents who were not citizens.
This was based on English common law because the Constitution itself does not define the term "natural born citizen". The Framers were well aware of English common law and the US had no separate common law.
I presume that if the Saudi ambassador chooses to recognize the child as his own, then KSA will recognize him as a citizen. But whether they do or don't, the US government doesn't care. For example, lets say 2 years later the ambassador changes his mind. Let's say he pulls strings in the KSA records department to unrecognize the child and has his/her citizenship revoked. It would still not affect the child's status as a citizen of the US: he/she would still be a natural born American citizen. What KSA does or doesn't think is irrelevant.
It just occurred to me that you probably have another issue in mind as well.
Is the child subject to US jurisdiction? Yes...unless the Saudi ambassador married the mother and did whatever paperwork is necessary to have the child added to his household. I don’t know what that would entail. I also don’t know what rules the State Department uses with the families of ambassadors if they get into legal trouble. I imagine this would be a sticky issue if a member of an ambassador’s household was also an American citizen. If I were making the decision, I would insist within the paperwork that the child be removed to KSA during the time that the ambassador was posted to the US. But I don’t know what would actually happen.