The Washington Post slammed Republican presidential nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE in an editorial for his "slimy" and "shameless" approach to philanthropy.

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In the editorial, published online late Wednesday, the newspaper questioned where Trump got his ideas that Mexico will pay for his proposed border wall and the Arab states will pay for refugee safe zones in Syria.

"Perhaps from the success he has had sleazily diverting money other people had donated to charity into paying off his business obligations," the paper's editors said.

They then quoted the GOP nominee talking about using other people's money.

“It’s called [the Office of Personnel Management]. I do that all the time in business. It’s called other people’s money,” Trump said Tuesday. “There’s nothing like doing things with other people’s money.”

The Post said one of the things Trump did with other people's money was fund his charitable foundation.

"Mr. Trump then used some of that funding to pay off business liabilities," the editorial said.

It cited claims made in a recent Washington Post report that the Republican nominee used more than $250,000 from his charitable foundation to settle lawsuits involving his for-profit businesses.

"It is likely that this sort of behavior is illegal, because charities are not supposed to engage in 'self-dealing' — activities that directly benefit the bottom lines of those running them," the editorial said.

"But even if Mr. Trump’s approach to 'philanthropy' is not technically illegal, it is still slimy and shameless. Sometimes charities associated with wealthy families or businesses tiptoe near ethical lines — but charity experts say Mr. Trump’s activity appears to be brazen."

The Post went on to criticize the Trump campaign's response to the newspaper's report. It describes the campaign's response as "brazen" and says the campaign did not give any evidence that the paper's report was inaccurate.

The paper then slammed Trump for refusing to release his tax returns.