It takes two citizen parents to make a natural born citizen.
Thanks.
Obviously our founders didn't care what Vattel thought when they extended natural born status to those born OUTSIDE the USA.
Minor v Happersett
“Additions might always be made to the citizenship of the United States in two ways: first, by birth, and second, by naturalization. This is apparent from the Constitution itself, for it provides that
No person except a natural-born citizen or a citizen of the United States at the time of the adoption of the Constitution shall be eligible to the office of President, and that Congress shall have power to establish a uniform rule of naturalization. Thus, new citizens may be born or they may be created by naturalization.”
Clear - either new citizens are born or they may be created by naturalization. Naturalization doesn't cover those born as citizens. Those who are born as citizens are natural born citizens.
Natural law is not one man's view in one book. U.S. law should always reflect our best understanding of natural law - OUR best understanding - not the best understanding of an 18th Century Swiss philosopher.