House Republicans are demanding answers from President Biden's son Hunter's financial adviser Edward Prewitt regarding his business deals, which have been flagged as suspicious by banks.

Biden has been under federal investigation for his tax affairs predicated by suspicious foreign transactions since 2018, and President Joe Biden has repeatedly denied discussing Hunter's business ventures with him.

The president's son's questionable business dealings, conducted by himself, his associates, and other Biden family members, have been flagged and reported by U.S. banks.

House Oversight Committee Ranking Member Rep. James Comer, R-Ky., sent a letter to Hunter Biden's financial adviser Edward Prewitt Wednesday demanding information about the Biden family's foreign business deals.

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NBC News reported this week on the contents of Hunter Biden's laptop as the president's son remains under a federal tax investigation. (AP Photo/Andrew Harnik)

Prewitt, who served as a political appointee under former President Bill Clinton, has advised Hunter on his financial transactions at the same time U.S. banks flagged them as "suspicious activity."

Oversight staff tell Fox News Digital that the committee has records showing Prewitt flagged for Hunter Biden that the bank Wells Fargo specifically was looking into some of the transactions made by the president's son. 

Comer requests Prewitt hand over documents and communications related to the Suspicious Activity Reports (SARs) by the banks.

"More than 150 transactions from the Bidens’ business dealings have been flagged by U.S. banks through filings of Suspicious Activity Reports (SARs) to the Financial Crimes Enforcement Network. Text messages show that Hunter Biden was aware of these SARs and took steps to avoid detection in his financial dealings," writes Comer. 

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"Information reviewed by Committee Republicans reveals you were advising Hunter Biden on financial transactions when U.S. banks were flagging suspicious activity by the Biden family. As Hunter Biden’s financial advisor, you are in a unique position to know how these transactions originated and why they were flagged by U.S. banks. As such, we request information regarding Hunter Biden’s financial transactions, including any documents related to SARs," continues the congressman in the letter.

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Grassley sent two new letters to the FBI and DOJ regarding the issues of partisan politics at play in the government's conduct of the Hunter Biden investigation. (Fox News)

The congressman in his capacity as the top Republican on the Oversight Committee is following Hunter's "money trail," which he says incude "many complex, international transactions worth millions of dollars."

"The American people deserve to know the President’s connections to his son’s business deals, which have occurred at the expense of American interests and may represent a national security threat," writes Comer.

Prewitt did not immediately respond to a request for comment from Fox News Digital.

Congressional oversight of the Hunter Biden probe has ramped up in recent weeks.

The top Republican on the Senate Judiciary Committee, Chuck Grassley, R-Iowa, pressed the Department of Justice and the FBI for an explanation about why they pursued "politically charged investigations" related to the Trump campaign while suppressing key details related to the Hunter Biden probe as "disinformation," in light of new whistleblower information.

Joe Biden's son Hunter's laptop was authenticated by NBC News on May 19

WASHINGTON, DC - APRIL 12: World Food Program USA Board Chairman Hunter Biden (L) and U.S. Vice President Joe Biden award designer Michael Kors (C) the World Food Program USA's McGovern-Dole Leadership Award at Organization of American States on April 12, 2016 in Washington, DC. (Photo by Paul Morigi/Getty Images for World Food Program USA) (Photo by Paul Morigi/Getty Images for World Food Program USA)

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And in light of the new whistleblower allegations, Sen. Ron Johnson, R-Wis., is demanding DOJ open an internal investigation or appoint a special counsel, and is claiming that the FBI was illegally "weaponized" against sitting members of the Senate.