In another sign he is ogling the White House, Donald Trump joined the birther-curious community on Thursday in an interview with ABC's 'Good Morning America,' fully airing his doubts that President Obama was born -- or even raised -- in the United States.

He premised his skepticism by defending others who don't believe the president is a native-born citizen. "Anybody that even gives any hint of being a birther ... they label them an idiot," he said. "And let me tell you, I'm a really smart guy ... The reason I have a little doubt, just a little, is because he grew up and nobody knew him."