I've seen this argument a few times now. What is the legal authority for this?
The naturalization act includes a requirement that citizen parent have resided in the US for five years after the citizen parent reaches the age of 14. Obama’s mother couldn’t have done this before she was 19, and Obama was born when she was 18.
If he was born in the US, he is not an NBC, but the argument is completely different from the one associated with Cruz, who is not NBC because he was naturalized at birth by operation of an Act of Congress.
The internet.