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But, as Blackstone explains the term "natural born", that can be as well accomplished by someone with two US Citizen parents who happens to be born outside the country, particularly when one or both of them are in it's service at the time. (To include ambassadors, embassy staff, and military). Blackstone even extends that to a person born outside the realm (he's speaking of England of course) whose father is a subject/citizen of the realm.

Yes, however Blackstone is clearly describing English law and its development in particular and not inducing larger points of natural law. Those points after all, are deduced, as the other commentators imply. Natural law would not carry much weight (or none) with Justice Scalia, anyway.

Tucker and Bingham do an excellent job of spelling out contempraneous understanding of what "natural born Citizen" means/meant to the framers (birth both in state and by citizen father, hence Tucker's "hereditary right").

Clearly, from John Jay's request (instruction) this was a defensive measure. I.e., he wanted to plug potential allegiance holes! (Both of them.)

Pinging some ol' philosophy buffs FY-somethingerother.