Donald Trump sat down with Obama's NBC News' Katy Tur and was asked why people should believe his numbers on illegal immigration when he led the birther movement and sent investigators out to Hawaii to investigate whether Obama was not born here. Watch Tur press Trump over the issue pleading that Obama released his birth certificate. Trump fired back: "According to you it's not true. If you believe that, that's fine. ... A lot of people don't agree with you on that..."