A major Republican donor who gave more than $2 million to Missouri Gov. Eric Greitens is calling on the GOP governor to resign following allegations he coerced a woman into sex and blackmailed her.

The Kansas City Star reported Thursday that Missouri businessman David Humphreys joined the chorus of those calling for Greitens to step down after a Missouri House of Representatives report detailed additional allegations against the governor.

Humphreys, the CEO of Tamko Building Products Inc., has previously donated millions more to other GOP campaigns and candidates. He said Thursday he was “deeply disappointed” by the report.

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“Gov. Greitens should resign as these new revelations describe behavior that makes it impossible to retain confidence in his ability to govern wisely and well,” Humphreys said.

The report, released Wednesday night, includes allegations that Greitens taped a woman’s hands to exercise rings, blindfolded her, undressed her and took a photo. The woman also claims that Greitens coerced her into giving him oral sex.

Republican and Democratic lawmakers in Missouri have called on Greitens to resign following the newest revelations.

However, the governor has been defiant and refused to step down. He maintained that he would be vindicated in court next month.

He has admitted to having an affair prior to being elected in 2016, but slammed the report as filled with falsehoods and called the allegations against him a "political witch hunt."