You your proof that he's not a natural-born citizen is...?
He has no SR511.
You’ll note he’s spending millions of dollars on hiding his birth certificate, plus the Kenyan birth certificate that Orly found, plus the forgery he presented as his COLB, plus his family members claiming he was born in Kenya.
Why, have you seen your saviour’s birth certificate?
Not proof, in a legal sense, but he claims his father was never a US citizen, ever. That's enough. It might be a little harder to understand than if, which is still possible, he was born abroad, and was never a citizen at all, or was later naturalized, but it's still enough for a disqualification.
Now for legal proof, you'd need his birth certificate, a real paper one, certified with raised seal, and possibly with affidavits. You'd also need some proof, that the person named on that BC as his father (if any!) was indeed not a US Citizen. In that I'm at somewhat of a loss how legal proof could be obtained. Maybe the government of Kenya would provide proof of citizenship for BHO Sr, whereas they'd be loathe to provide any such proof, if it exists, about BHO II's. Perhaps Visa records are maintained? If so they'd show British National BHO entering in '59, extending in '62, when he went to Harvard, and perhaps in between. (Or perhaps U of H, and Harvard) would have records of foreign students?)
But even the possibility, if even only somewhat probable, that an ineligible person sits in the Oval Office, and acts as Commander in Chief, ought to give you the willies. It should also be the starting point for whatever investigations can be conducted.
An honest man would be fully cooperating with those investigations, as long as they were limited to the single question of eligibility. In an earlier case, his lawyers claimed something on the long form would be deeply and personally embarrassing. Now what could that be? Bastardy perhaps, or a father other than BHO Sr. is about the extent of what it could be, that is not already known, such as his mother being "Caucasian", and still not constitute being ineligible, which would certainly be deeply embarrassing, to say the least.