Washington (CNN) – Self-proclaimed birther Donald Trump is now so doubtful of President Obama's birthplace that he's sent a team of his own investigators to Hawaii in hopes of getting to the bottom of the issue.
That's according to Trump himself, who, in an interview with NBC, warned his investigators just might uncover "one of the greatest cons in the history of politics and beyond."
"I have people that have been studying it and they cannot believe what they're finding," Trump said an interview that aired Thursday Morning.
Asked if he has assigned people specifically to search in Hawaii, Trump said, "Absolutely."
The business mogul, who in a new NBC News/Wall Street Journal Poll is tied for second place among potential presidential candidates, also suggested the president is involved in an ongoing cover-up over the matter.
"He spent $2 million in legal fees trying on to get away from this issue, and if it weren't an issue, why wouldn't he just solve it?" he said. "I wish he would because if he doesn't, it's one of the greatest scams in the history of politics and in the history, period. You are not allowed to be a president if you're not born in this country. Right now, I have real doubts."
According to a recent CNN/Opinion Research Corporation national poll, 72 percent of Americans say that the president was definitely or probably born in the U.S., with one in four saying that he was definitely or probably born outside the country. But the survey indicates a partisan divide, with 43 percent of Republicans but only 11 percent of Democrats saying that Obama was definitely or probably born outside the U.S.
In 2008, the Obama campaign produced a certification of live birth that reports his birthplace as Honolulu, Hawaii – a document the Hawaii government says is official evidence of his birth in the state. Among other evidence of Obama's birth there is the fact the hospital where he was born took out ads in two Hawaiian newspapers in 1961 announcing the birth, while current Gov. Neil Abercrombie says he knew Obama's family and remembers his birth.
In the broad interview, Trump also insisted he's more serious than ever about mounting a presidential bid, but said he can't make a final decision until this season of "Celebrity Apprentice" wraps up.
"I hate to say it. I have the No. 1 show on NBC. Is that the correct statement? The "Celebrity Apprentice" is doing great," said Trump. "You're not allowed to have a show on and be a candidate. It's a great show and it's got phenomenal ratings, and until that show is over I can't declare, otherwise NBC would have to take the show off the air and that would be very unfair."
The show is set to wrap up in mid-May.