The son of a Democratic presidential candidate was allegedly involved in transacting millions of dollars in illegally obtained cash under the false pretense of financial lending, a legal expert has revealed.

President Donald Trump’s personal lawyer Rudy Giuliani has produced what he calls irrefutable evidence of at least one money-laundering transaction involving Joe Biden, his son former Burisma Holdings Director Hunter Biden, several companies, and a Ukrainian official between July 2012 and July 2015.

“I have what I used to call when I was an attorney a ‘smoking gun,'” he told Fox News’s “Watters’ World” program. “This is a money-laundering transaction that occurred just at the time [then Ukrainian Prosecutor General Viktor] Shokin was fired and it is about $14.6 million and it was a notice from the Latvian government to the Ukrainian government that Hunter Biden is under investigation for corruption.”

Giuliani, who was formerly the New York City mayor, believes the amount was a payment falsely declared to be a loan. After some time had passed the borrower would default on his loan, not be required to repay the rest of the money and instead be charged a small penalty fee.

“$14.6 million goes from Ukraine to a company in Latvia disguised as a loan, then it goes from Latvia to another company disguised as another loan in Cyprus, and then it goes to the United States,” Giuliani said. “We lose track of it because just when Shokin gets it, just about the day he is fired, there is no money here for [Burisma directors] Devon Archer and Hunter Biden.”

Senate Judiciary Committee Chairman Lindsey Graham (R-S.C.) confirmed the Department of Justice has already started investigating and verifying Giuliani’s evidence.

“The Department of Justice is receiving information coming out of the Ukraine from Rudy,” Graham said according to Reuters. “[Attorney General William Barr] told me that they have created a process that Rudy could give information and they would see if it is verified.”

Republican Sens. Chuck Grassley and Ron Johnson are separately conducting an investigation of U.S. government records to check whether Joe Biden’s time as vice president and his son’s board role at Burisma could be considered a conflict of interest.

Graham confirmed the allegations are being treated with utmost care during the investigation.

“They told me: ‘Take very cautiously anything coming out of the Ukraine against anybody,'” he said according to Reuters. “Any documents coming out of the Ukraine against any American, Republican or Democrat, need to be looked at by the intelligence services who have expertise.”