If he wasn't born in Hawaii as claimed then that kind of decides the issue right there.
No, the debate is whether the “native born” law is interchangeable with the discussion regarding “natural born.” I believe the courts will rule that it is.
It then becomes an issue of how old his mother was, how long she’d been in the US, how long outside the US, etc. Only one parent has to be a US citizen per the “native born” law.