Let me put that one to rest.
If he was an American citizen, no action that he or his parents took while he was a minor are capable of removing his citizenship. The Supreme Court has been very clear on that in several cases. Among others: Perkins v. ELG, 307 U.S. 325 (1939)
There may be legitimate issues to raise, but this isn't one of them.
Thanx. Got it. So, if natural born, always natural born. That would make sense.