COLORADO SPRINGS — Billionaire Charles Koch rejected in the most forceful terms possible rumors that he's considering lending his support to Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE.

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"I want to correct a rumor that the media keeps stimulating, and that is that I am probably going to support Hillary.

“That is a blood libel,” Koch said on Sunday afternoon.

A blood libel refers to a centuries-old false allegation "that Jews murder Christians — especially Christian children — to use their blood for ritual purposes," according to the Anti-Defamation League.

Koch, who together with his billionaire brother David helms the most powerful donor network in conservative politics, laid out in more detail his rationale for refusing to support either Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE or Clinton in the general election.

He did so before an audience of some 400 donors here at the Kochs' summer donor retreat in a luxury resort at the foothills of the Rocky Mountains.

The Kochs' decision not to support Trump, the GOP nominee, has faced blowback within the network, with a number of donors arguing that it's the group's responsibility to use some of its $250 million policy and political budget for 2016 to help elect the Republican nominee.

But just as Charles Koch rejected similar pushes from his donors to oppose Trump during the primaries, he's equally determined to stand his ground now.

Koch said he believes neither Clinton nor Trump will fight for the issues he cares about: free trade, reducing the scope of government programs such as Social Security, paring back foreign military engagements, ending corporate subsidies, cutting regulations and the equal treatment of all ethnic and religious groups.

Koch is especially horrified by Trump's proposal during the primary season to register all Muslims on a database, and he's described Trump's trade policies as a "monstrosity."

“At this point, I can’t support either candidate, but I’m certainly not going to support Hillary," he said on Sunday.