Vice President Harris’ former communications director recently said there is one Republican who would be the "greatest threat" to her vice presidency if chosen as former President Trump’s 2024 running mate.

Ashley Etienne, who served as Harris’ communications director in 2021, told CNN on Friday that she believes Ohio Sen. JD Vance, R-Ohio, is an "incredible debater" and could present a challenge to Harris in the upcoming election.

"I think JD Vance would pose the greatest threat [to] Kamala Harris, in some respects. I mean he's an incredible debater," Etienne told CNN. "I think he has this quality that makes him seem palpable to that one to two percent that actually might vote or that is undecided, that will actually pay attention to the debates because most people don't pay attention to the debates."

Etienne, who also served as deputy assistant to President Biden after his 2020 victory, said Vance is "super smart," "quick-witted" and could pose a threat to Harris on the debate stage.

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"I think he's just got a quality about him where he's super smart and sharp and quick-witted. I just think it's going to be a challenge to see the two of them face-to-face. I mean, maybe it's just me, but I think he's going to be the greatest threat," she said.

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The comment comes as Harris’ disapproval rating remains high with 55% of registered voters having an unfavorable opinion of the vice president, according to a Fox News national survey from May.

Vance is on Trump's short list for vice president along with several other top Republican contenders. However, it was recently revealed that the first-term senator was one of only three from the candidate pool who had vetting documents requested from Trump's campaign team.

Vance has shown staunch support for Trump throughout his campaign and legal woes, recently joining the former president at a Manhattan courtroom where he was eventually found guilty on 34 charges related to falsifying business records.

Fox News Digital previously reported on Vance's Silicon Valley donor network, which could help boost Trump's ticket if he is chosen as Trump's VP nominee.

Vance, after serving as a Marine in the Iraq War, moved for a handful of years to San Francisco to work as a venture capitalist in the tech industry.

And Vance – the author of the bestselling memoir "Hillbilly Elegy," which was made into a Netflix film – two years ago won his own crowded and combustible GOP Senate primary thanks in part to Trump's late-in-the-game endorsement. 

"JD has a Rolodex of Silicon Valley contacts that very few Republican figures can get to. And he put some of those to use on behalf of [Republican U.S. Senate candidate from Ohio Bernie] Moreno," a source in Vance's political orbit previously told Fox News.

Trump recently told Fox News that he has "a pretty good idea" of who his vice presidential pick will be, an announcement that he confirmed could be made at the Republican National Convention in July.

Fox News Digital reached out to Harris for comment.

A Democratic member of the House Oversight Committee alleged Monday that several in her party who had initially indicated support for a bipartisan presidential ethics bill got cold feet after talking to the White House.

Rep. Katie Porter, D-Calif., previously announced the filing of a "landmark federal ethics reform bill" with Rep. James Comer, R-Ky., the committee’s chairman, targeting financial disclosures, family members joining official travel junkets and other issues.

Comer and Porter announced the Presidential Ethics Reform Act in late May, which itself reportedly stemmed from a back-and-forth between lawmakers during a March hearing on the impeachment inquiry into President Biden.

Porter, who lives in Orange County, California, claimed Monday that after she and Comer worked to recruit an equal number of bipartisan co-sponsors, the deal imploded while she was in the air on her way back to Washington.

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"I … was proud that I had found three senior Democratic co-sponsors. When I landed, I was really disappointed to learn that those co-sponsors had decided not to support the bill and had had conversations with the White House," Porter claimed in comments to The Hill newspaper.

Fox News Digital reached out to the White House for comment, as the paper cited three Democratic lawmakers it reported to be whom Porter was referring – Reps. Ro Khanna, D-Calif., Kweisi Mfume, D-Md., and Raja Krishnamoorthi, D-Ill.

Mfume declined comment and the other two lawmakers did not respond. Porter’s office also did not provide comment.

A source familiar with the situation, however, confirmed reports on the matter to Fox News Digital.

The ethics bill did garner at least one major public supporter, as billionaire "Shark Tank" investor Mark Cuban posted, "All for this."

Congress’ official website shows Comer introduced the legislation on May 22 and listed Porter as its only current co-sponsor. Congress.gov indicated the bill has since been referred to the Oversight Committee.

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During a March 20 Biden impeachment inquiry hearing, Porter said the probe hit a "dead end" and that the next step should be to "stop bipartisan attacks on each other."

"The American people think that the rules that prevent corruption are way too weak to stop politicians from both sides of the aisle from influence peddling," Porter added. 

After she ended her remarks, Comer interjected to say he believed the Democrat was "sincere" and that he "look[ed] forward to working with [her] on that legislation" in the future.

The bill would require presidents and vice presidents to record and disclose payments or "items of value" given to them by foreign sources two years prior to and after their terms, as well as while they are in office.

It would also require the two top national executives to disclose inter-familial payments of more than $10,000 during that same time period, and also provide stricter rules regarding disclosure of conflicts-of-interest.

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"Influence peddling is a cottage industry in Washington, and we’ve identified deficiencies in current law that have led to a culture of corruption," Comer said of the bill.

"By creating this bipartisan legislation to provide greater transparency to the financial interactions related to the office of the president and vice-president, we can ensure that moving forward, American presidents, vice presidents, and their family members cannot profit from their proximity to power."