NEW YORK -- Donald Trump has a deal for President Barack Obama -- if he releases his college and passport records, the real estate mogul will contribute $5 million to a charity of Obama's choice.

Trump made the announcement Wednesday in a video posted to his Twitter account. He called Obama "the least transparent president in the history of this country."

Trump has endorsed Republican Mitt Romney in the presidential race. Trump drew broad publicity last year for questioning whether Obama was born in the U.S. and eligible to be president, forcing Obama to release his long-form birth certificate.

In the video, Trump said he was proud to have pushed Obama to release the birth certificate or "whatever it may be."

Obama campaign spokeswoman Jennifer Psaki declined to comment on the Trump video, saying, "Given Trump is one of his biggest supporters, this is a question best directed to the Romney team in Boston."