The book that people keep referencing when they claim it defines “natural born citizen”.
Ah, thanks for clarifying.
de Vattell did define NBC, whether you believe the Founders used that definition is up for debate.
I personally think de Vattell's definition makes sense when viewed that the Founders wanted un questionable loyalty.
For example, if Cruz became POTUS, granted the pipeline from Canada, could an argument be made he is partial to Canada because it's his birthplace?
You know the argument would be made and it has merit.
Similarly, even though Cheney divested any interest in Halliburton, the argument was, well, you know the history of that.
The point is, when a POTUS has no other allegiance other than to the US, loyalty becomes moot, and that's its what the Founder intended, JMHO.