It's an interesting argument. I think Vattel's original definition and the various same interpretations over several SCOTUS cases is enough to establish precedent. I'm sure there are other forms of history that could establish this as well... the constitutional conventions, the exemption of the first several presidents to the rule out of necessity, and various other common law history in Europe.
I'm curious what prevents the perpetuity of citizenship along the following lines:
A female U.S. citizen marries a foreign citizen and gives birth in a foreign nation. If that child is assumed to be natural-born citizen, then all his children are natural-born and all their children are natural-born. In fact, they could go 10 generations like this and one day come to America and qualify for President? How does this prevent foreign influence or provide an avenue for foreign invasion?
I don't think it's difficult to see why the present argument is wrong and entirely out of the spirit of the framers. If this was the intent, there would have been no necessity to distinguish natural-born from other forms of citizenship.
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