Natural born is an intrinsic quality that one is born with or not. It is like race.
It would be like congress a rule that Obama was a natural blond and blue eyed woman. It would be like congress making a law that the sky was green and purple.
No law can change this intrinsic quality.
It is about loyalties and interests. I heard an interview from a father that lost his son in the 9/11 attack. He said “I do not care what color the skin is of my president. I care what color his heart is. It better be RED WHITE and BLUE.