Joe Biden's brother is accused of using the former vice president's political position to further their private business and impress potential investors.

James Biden promised executives at Integrate Oral Care that his brother would promote their business, and specifically their oral rinse commonly used by cancer patients, as part of the Biden Cancer Initiative, a participant in the conversation told Politico.

The new allegation is the latest in Biden's family invoking the former vice president to drum up their private business dealings. Most recently, his son Hunter Biden has been making headlines for his previous spot as a board member at Ukrainian natural gas firm Burisma Holdings.

Toward the end of Biden's service as vice president, his son Beau Biden died of brain cancer at the age of 46. Biden, now a 2020 presidential candidate, made his cancer initiative a priority after leaving the White House and following the death of his son in May 2015.

Last year, James' business partners were considering investing in Integrate, and during a November 2018 phone call, he promised the Florida-based oral care firm that he would use Joe's political clout to bring more exposure to the firm, according to Michael Frey, whose healthcare firm is suing James.

Joe Biden's brother James Biden (right) used the former vice president's political clout to help drum up business and impress potential investors. 'He said his brother would be very excited about this product,' a person describing a business phone call with James detailed

James (right) promised to executives at Integrate Oral Care that his brother Joe (left) would promote a its oral rinse, commonly used by cancer patients, as part of the Biden Cancer Initiative. James' business partners were considering investing in Integrate last year

Frey, the CEO of Diverse Medical Management, introduced the group to Integrate and claims he was on the call.

'He said his brother would be very excited about this product,' Frey said of James.

A spokesman for James and Platinum Global Partners, David Fuscus, disputed Frey's account, claiming that he never spoke with Joe about his personal business dealings.

'These charges stem from a frivolous lawsuit and are pure fantasy. We are not surprised that such baseless accusations have emerged during the Democratic primaries,' Fuscus said. 'Jim Biden has been clear and consistent that he does not, and has never, discussed his business ventures with his brother.'

Diverse Medical Management's lawsuit against James and his partners alleges that they were involved in a fraudulent scheme to bring the healthcare firm to bankruptcy and steal its business model.

And Integrate is also suing James' business partners at Platinum Global Partners for breaching its contract and failing to follow through on investing $3 million in the firm.

The Biden Cancer Initiative, which closed in July, was a private foundation launched in 2017 by the former vice president and his wife, Jill Biden.

Biden oversaw the Obama administration's Cancer Moonshot during the final year of his vice presidency and his initiative post-White House was conceived as an extension of that program.

Cancer Moonshot was a program that aimed to develop cancer treatments.

Right before launching his presidential campaign, both Biden and his wife stepped down from the board of the cancer initiative in April before it dissolved over the summer.

The new allegations come as Biden's son Hunter Biden (left) is making headline for is business dealings in Ukraine and his father's potential involvement in that

Joe Biden insisted he never talked about his son's overseas business, but Hunter claimed he consulted his dad about whether he should keep the job a year after he took a position on the board of Ukrainian natural gas firm Burisma Holdings

Biden's involvement in his relatives' private business ventures has been at the forefront ever since a whistle-blower alleged that Donald Trump pressured Ukrainian President Volodymyr Zelensky to investigate Hunter Biden's business in Ukraine.

In 2014, while Joe was still serving as Obama's vice president, Hunter was hired by a Ukrainian natural gas firm. As a board member, Hunter reportedly made $50,000 a month, but he stepped down from the company earlier this year.

Burisma Holdings had ties to then-Ukrainian President Viktor Yanukovych, a pro-Russia leader, which raised eyebrows in Washington. But at the time, the White House insisted that since the vice president's son was a private citizen, there was no conflict of interest.

Joe also insisted that he never discussed his son's business in the Ukraine, which was contradicted by his son's own account earlier this summer.

In a New Yorker article a few months ago, Hunter recalled a 2015 conversation he had with his father about Burisma: 'Dad said, ''I hope you know what you're doing,'' and I said, ''I do.''

The Democratic front-runner said last month that if elected president in 2020, he would completely separate his family's business dealings and his administration to steer clear of any conflicts of interest.

'I have never discussed, with my son or my brother or with anyone else, anything having to do with their businesses. Period,' he asserted in August. 'And what I will do is the same thing we did in our administration. There will be an absolute wall between personal and private [business interests] and the government.'

Trump insists he didn't try to pressure Zelensky to probe Hunter and Joe, but the allegations alone led Democrats who were on the fence to call for his impeachment.

On Tuesday, House Speaker Nancy Pelosi announced that the lower chamber of Congress was formally launching an impeachment inquiry into the president.

Trump released an unredacted version of a transcript of his July 25 call with Zelesnky, which he said would prove he didn't discuss anything nefarious.

The bombshell transcript shows that Trump did urge his Ukrainian counterpart to investigate Biden, but does not indicate he tried to tie that probe to millions in military aid to Ukraine.