Truer words were never written.
People made citizens at birth by law are statutory born citizens naturalized at birth by law. The citizenship of true natural citizens depends on no law.
When one is born in the USA to parents both of whom were citizens when one was born, one is by inherent nature born a USA citizen because no other citizenship outcome is possible. One's natural born allegiance lies 100 percent with the USA.
The SCOTUS has never directly addressed the issue of the definition of natural born Citizen. The closest they have come is in Minor v. Happersett, which held:
The Constitution does not in words say who shall be natural-born citizens. Resort must be had elsewhere to ascertain that. At common law, with the nomenclature of which the framers of the Constitution were familiar, it was never doubted that all children born in a country of parents who were its citizens became themselves, upon their birth, citizens also. These were natives or natural-born citizens, as distinguished from aliens or foreigners.
My son was born in the United Kingdom of USA citizens. He is a dual national quite legally with both United Kingdom and American Citizenship.
He can legally hold any office in the United States with the exception of President or Vice President.