Brock said he would not release the donor's name, but he said the person was a Republican. Brock asserted that he had both "a signed legal commitment from the donor awaiting Donald Trump’s signature" and a "a bank-verified letter [stating] the funds are available."

A "proof of funds" letter provided by a spokeswoman for Brock said the donor had assets with the bank "in excess of $10 million" as of July 7. The names of the donor and the bank were redacted.

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"Time and again we’ve seen how Donald Trump is factually challenged, and we can only assume he’s playing fast and loose with the facts on how much he’s paid in taxes, how much he’s worth, how much money he’s made off of potentially fraudulent business schemes, how much he’s given to charity and more until we see his tax returns," Brock said in a statement. "Every modern presidential candidate has been transparent on this basic hurdle and now Trump has another incentive to do the right thing."

The statement said that if Trump releases his tax returns "on or before July 15," the $5 million would be donated to a veterans' charity of his choice.

Trump has so far declined to release any recent returns — if he is nominated by the GOP next week, as expected, he will be the first major-party nominee in 40 years not to release his taxes.

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If released, the documents might provide details about Trump's income, the state of his businesses and how much he donates to charity. Trump and his aides have said repeatedly that Trump gives generously to charity out of his own pocket.

But in recent weeks, The Washington Post has searched for evidence of those donations, largely in vain. Between 2008 and this May (when Trump made good on a pledge to give $1 million to veterans groups, under media pressure), The Post found just one donation from Trump to a charity.

It was in 2009, and it was for less than $10,000. It also might be a bookkeeping error.

The returns would also, of course, show how much taxes Trump pays. The last time Trump's taxes were released to the public — back in 1981, showing returns from the late 1970s — they showed he paid the federal government $0 in income taxes.

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Trump's answers about his taxes — and his explanations about why he won't release them — have changed over the course of this year.

In January, Trump said on NBC’s “Meet the Press” that he was ready to disclose his “very big ... very beautiful” returns.

But then, Trump backed away from his declaration. He first claimed that ongoing audits by the Internal Revenue Service prevent disclosure.

Then, in May, he told the Associated Press that voters are not interested in seeing his tax filings and that “there’s nothing to learn from them.” Trump told The Washington Post in May that he pays "substantial" taxes but that he fights “very hard to pay as little tax as possible.”