Lord Christopher Monckton pointed out that anyone can go and get his birth certificate. In most countries there is nothing secret about a birth certificate. And this is reasonable, since there’s nothing secret about having been born.
Unless, of course, you want to usurp the office of the presidency, and you are totally ineligible.
Bet Gov. Pothead Abercrombie was also THERE to witness Sun Yat-sen's Hawaiian birth and went to his t-ball games, too.