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Vice President Kamala Harris called Sen. JD Vance, R-Ohio, whom former President Trump chose as his running mate Monday, and congratulated him after the announcement. 

"Vice President Harris reached out to Senator Vance and left a message to congratulate him on his selection, welcome him to the race and express her hope that the two can meet in the vice presidential debate proposed by CBS News," a Biden campaign official told Fox News. 

After months of teasing his pick, Trump revealed Vance as his running mate selection in a Truth Social post on the opening afternoon of the Republican National Convention. 

LIVE UPDATES: REPUBLICAN NATIONAL CONVENTION

JD Vance, Kamala Harris in photo split

JD Vance might be the worst case scenario for Vice President Kamala Harris ahead of the 2024 election.

In May, Trump accepted a vice presidential debate on behalf of his future running mate to be hosted on Fox News. However, the Biden campaign has only been willing to do the debate on CBS. 

While no vice presidential debate has been confirmed yet, in the case that Vance and Harris do face off, it may be the vice president's worst-case scenario. President Biden and former President Trump agreed to two presidential debates. The first was hosted by CNN on June 27 and the second will be hosted by ABC on Sept. 10.

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JD Vance on the Republican convention floor in Milwaukee

Trump's pick for vice president, Sen. JD Vance, arrives on the first day of the Republican National Convention on July 15, 2024 in Milwaukee, Wisconsin. (Win McNamee/Getty Images)

"I think JD Vance would pose the greatest threat [to] Kamala Harris, in some respects. I mean he's an incredible debater," Ashley Etienne, Harris' former communications director, previously 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," she explained. 

TRUMP PICKS JD VANCE AS RUNNING MATE AS HE BECOMES GOP PRESIDENTIAL NOMINEE

Kamala Harris shrugging shoulders

Vice President Kamala Harris speaks at a campaign rally on June 28, 2024, in Las Vegas.  (Bizuayehu Tesfaye/Las Vegas Review-Journal/Tribune News Service via Getty Images)

She described the 39-year-old senator as both "super smart" and "quick-witted," which she noted could be a problem for Harris. 

This could pose a particular issue for the vice president, who has become known for "word salads" or rambling monologues that often find their way onto social media. One such clip going viral on TikTok and other social media platforms features Harris asking, "You think you just fell out of a coconut tree?"  

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President Biden, left, with VP Kamala Harris, right

President Biden and Vice President Kamala Harris arrive for a wreath laying ceremony at the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Virginia, May 27, 2024. (Mandel Ngan/AFP via Getty Images)

After laughing, she continues to say, "You exist in the context of all in which you live and what came before you."

Harris has even been the subject of a "Saturday Night Live" skit, which made fun of the habit. "It’s a process I call speaking without thinking," joked Daily Show correspondent Desi Lydic, playing the role of the vice president's "holistic thought adviser, Dahlia Rose Hibiscus."

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"It’s not about the destination of the thought, it’s about the journey and how many words you use to describe the journey," she added. 

One author, Elaina Plott Calabro, who profiled Harris for months at the Atlantic remarked, "She’s a very poor communicator when the parameters are quite wide."

In a setting such as a debate, where communication is one of the most important elements, its unclear whether Harris would be able to stack up. 

Get the latest updates from the 2024 campaign trail, exclusive interviews and more at our Fox News Digital election hub.