Doesn't really matter where he was born, he was not born of US citizen parents. Sure if he was born outside the US, then he wasn't eligible to be a citizen at birth, but even born in the US, he's not a natural born citizen, but merely a native born one. (Which BTW, is all he has ever claimed, personally or through spokeswienies).
If he was not born in the US then he is not eligible to be President.