There's been little done in the way of court cases or statutes to hedge in and qualify what "natural born" really means.
You are in error. The requirement is to be a “natural born citizen” ~ not that he must actually be born in the USA. You can presently be born outside the USA and if one of your parents is a US citizen you will qualify. Not so long ago if you were born outside the USA to a foreign mother, or father, you were not automatically a US citizen.
There’s been little done in the way of court cases or statutes to hedge in and qualify what “natural born” really means.
#177:
My Civics class taught us that the Constitution meant that to be a natural-born citizen meant that you had to be born on US soil and that included military installations outside the US if both (?) parents were US citizens.