Is Donald Trump a "Birther"?

Has Donald Trump joined the "birther" movement? The possible future Republican presidential candidate has started to hint that he may be questioning whether President Obama is really a citizen of the United States. INSIDE EDITION reports.

Is Donald Trump a "birther?"

"Everybody that even gives any hint of being a birther, even a little bit of a hint, like gee you know, maybe, just maybe, this much of a chance, they label them as an idiot. Let me tell you, I'm a really smart guy. I was a really good student at the best school in the country. The reason I have a little doubt, just a little, is because he grew up and nobody knew him," Trump said.

That's right, the potential Republican presidential candidate is defending the controversial "birther" movement in an interview with Good Morning America.

"Nobody ever comes forward, nobody knows who he is until later in his life," Trump alleged.

Of course, the birther movement has been scoffed at for years. The questions continue even after the White House provided a copy of President Obama's birth certificate establishing he was born in Hawaii in 1961.

And people from his kindergarten class have come forward. One teacher says she recalls the young Barack as "very well mannered, respectful, confident and independent."

Other Republicans besides Trump are still questioning Obama's birthplace, and therefore his right to be president.

"Can you just state very clearly that President Obama is a Christian and he is a citizen of the United States?" GMA's George Stephanopoulos asked Tea Party leader Michele Bachmann.

"Well that isn't for me to state, that's for the President to state," responded Bachmann.

Republican Sarah Palin told radio host Rusty Humphries she thinks the birther issue is fair game.

And Comedy Central's Stephen Colbert poked fun at Florida congressman Bill Posey, the sponsor of a so-called "birther bill" that would require presidential candidates to submit their birth certificates.

"I am demanding DNA tests to determine whether Florida congressmen are part alligator. I have had enough with the reckless whispering!" joked Colbert.

Donald Trump has joined the birther debate, and says the whole thing is "very strange."

Trump says he is still toying with the idea of running for president and says he would spend $600 million of his own money to run.