Donald Trump promised to personally contribute more than $460,000 to various charities chosen by "Celebrity Apprentice" contestants during his seven seasons on the show, but new details about the donations suggest they may not have come from Trump after all.

According to the Washington Post, Trump's frequent pledges to send money "out of my own wallet" to the charitable institutions chosen by celebrities on his show were later fulfilled by production companies or from his personal nonprofit, the Donald J. Trump Foundation, to which he has no record of contributing to since 2008.

"I think that you're so incredible that — personally, out of my own account — I'm going to give you $50,000 for St. Jude's," Trump told one contestant during the show's first season, according to transcripts obtained by the Post.

The $50,000 check that was eventually sent to St. Jude's came from the Trump Foundation, which has been mostly filled through outside donations. The foundation's assets reportedly totalled $4,238 in 2007 before the WWE, which was owned by Trump's pal Vince McMahon, made a contribution of $4 million.

In 2009, Trump promised to make a donation to the Brent Shapiro Foundation on behalf of outgoing contestant Khloe Kardashian. "I'm going to give $20,000 to your charity," he told her.

This time, the check came from Reilly Worldwide, a TV production company in Los Angeles. The same company sent a check to the Baseball Assistance Team, a charity chosen by former MLB outfielder Jose Canseco and to which Trump himself said, "I'm gonna give $25,000."

The Post found that Trump, on at least 21 separate occasions, promised to cut a check to a contestant's charity from his own pocket. In each instance, the checks came from his foundation, a production company or never arrived at all.

Trump campaign spokeswoman Hope Hicks said she had yet to read the story when the Washington Examiner reached out for comment. She did not return subsequent requests.

A spokeswoman for NBC, the network that produced Trump's Apprentice franchise, did not return a separate request for comment.

Trump, the Republican nominee for president, has previously faced questions about his history of charitable giving. The billionaire was forced to hold a press conference earlier this year to clarify the amount he had raised at a veterans' fundraiser in January and when payments to the 41 different veterans' charities had been mailed out.

Hillary Clinton and many of Trump's conservative critics have spent months suggesting that he may be refusing to release his tax returns partially because he hasn't given away much to charity.

When Buzzfeed contacted the Trump campaign in June about the candidate's charitable giving, his spokeswoman responded by saying Trump "makes contributions personally and there's no way for you to know or understand what those gifts are or when they are made. We appreciate your interest in his charitable giving, which is generous and frequent."