Trump's Obama announcement, Donald Trump, the real estate mogul, reality TV star and de facto leader of the "birther" movement, says he is planning a "big announcement" about President Barack Obama.

"I have something very, very big concerning the president of the United States," Trump told "Fox & Friends" on Monday during a phone interview. "I will be announcing it sometime probably Wednesday and it's going to be very big."

"Will it change the election?" co-host Gretchen Carlson asked Trump.

"Possibly," Trump replied. "It's very big—bigger than anybody would know."

Trump—who has been live-tweeting during the presidential debates—said he would likely make the announcement on "the Twitter."

The "Celebrity Apprentice" host was supposed to deliver a "big surprise" at the Republican National Convention in Tampa, Fla., but Hurricane Isaac forced the GOP to cut his appearance from the truncated schedule. The "big surprise"? A video featuring an Obama impersonator who Trump predictably fired.

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