He didn’t...Hillary went back to it!!
obama is very likely not even an American citizen much less a natural born American citizen.
The evidence of this is overwhelming. It's unreasonable to think that many years before obama ran for president he had put into print that he was born in Kenya. Add to it all the other references to obama being Kenyan born and the total lack of any tangible proof of US citizenship and you are simply BEYOND REASONABLE DOUBT.
obama was never the legitimate US president.