Donald Trump has said he will release the tax documents after his audit is complete, although the IRS said in February that there is no rule prohibiting the real estate mogul from doing so earlier than that. | Getty Anonymous GOP donor pledges $5 million if Trump releases tax returns

An anonymous donor has promised to give $5 million to a veterans charity of Donald Trump’s choosing if the presumptive Republican presidential nominee releases his tax returns, political operative and Clinton backer David Brock plans to announce Wednesday.

The Manhattan billionaire has long refused to release his tax returns, arguing that he cannot do so because he is currently being audited by the Internal Revenue Service. Trump has said he will release the tax documents after his audit is complete, although the IRS said in February that there is no rule prohibiting the real estate mogul from doing so earlier than that.


A release previewing a conference call with Brock scheduled for Wednesday says the $5 million challenge “represents an opportunity to fill in some of the unknowns about Trump including how much he has made off of potentially fraudulent ventures and how much he’s actually paid in taxes.

"What we do know about Trump’s taxes shows that he’s gone to great lengths to pay as little as possible,” the release continues. “Meaning that he is avoiding paying his fair share and shifting that burden to other taxpayers.”

Trump’s November opponent, presumptive Democratic nominee Hillary Clinton, released eight years of tax returns in July 2015 and has attacked Trump for not doing the same.

“[Trump] needs to release his tax returns. The only two we have show that he hasn’t paid a penny in taxes,” she said on NBC’s “Meet The Press” on May 22. “It may be that he hasn’t paid — ever — any federal income tax. That’s why we want to see his tax returns.”

Trump said in May that he expected his audit to be complete before election day, at which point he will "gladly" hand over his tax returns. He told ABC's George Stephanopoulos that the media is "not going to learn anything" once those documents are released, however.