A Utah Republican convention delegate supporting the effort to unbind delegates pledged to back presumptive GOP nominee 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 is accusing Trump's honorary New York campaign co-chairman of threatening her.

Stefani Williams, a vocal member of the Free the Delegates movement, told The Hill that Carl Paladino sent a menacing email in response to her pitch to the convention's credentials committee. Paladino serves on that committee.

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"You should be hung [sic] for treason Stefani. There will not be a Republican Party if you attempt to replace Trump. I'll be in your face in Cleveland," Paladino allegedly wrote, according to an email that Williams shared with The Hill.

The email's sender matches an email address used by Paladino, a former New York gubernatorial candidate.

"I was pretty taken aback that a delegate, for one, and a member of the credentials committee would send such a nasty, threatening email," Williams told The Hill.

"There have been some less-than pleasant emails I've received from delegates, but this was the top."

When reached by email Thursday, Paladino didn't deny that he had sent the message.

"What the person was proposing is to encourage violation of the rules of the Republican Party under which Donald Trump rose legally to be the presumptive candidate," Paladino wrote in an email to The Hill. "The person is being treacherous to the party in doing so and as such the colloquialism is appropriate and if the person's underwear is all bunched up over his or her sensitivity to my reaction then tell the person if he or she can't take the heat of what he or she dished out, then get out of the kitchen."

Williams has written for The Hill's Contributor blog to describe her belief in unbinding delegates.

The Trump campaign did not respond to a request for comment.

Paladino has not shied away from controversy throughout his political career, specifically during this presidential cycle. He told The Buffalo News last month that "if there is any attempt in the rules committee to somehow allow delegates to go away from their pledged duty, there's going to be a war."

The allegations come after a tense day at the pre-convention Rules Committee meeting in Cleveland, where party leaders and the Never Trump movement are on a collision course.

Updated at 9:30 a.m.