Questions regarding Microsoft co-founder Bill Gates’s relationship with the late, notorious U.S. sex offender Jeffrey Epstein have arisen following the release of documents related to the case. Consequently, the billionaire is testifying behind closed doors on Capitol Hill this Wednesday. This marks one of the most high-profile hearings conducted by congressional investigators to date.

The U.S. Department of Justice released several documents earlier this year, revealing compromising information and various allegations against Bill Gates. Additionally, details emerged regarding collaborations on philanthropic initiatives between Gates and Epstein—information far more extensive than previously known. Following these revelations, the House Oversight Committee requested Gates’s voluntary cooperation.

This marks the committee’s 15th inquiry into the matter. Lawmakers from both the Republican and Democratic parties are expected to question Gates about the exact nature of his closeness to the late billionaire.

Videos and photographs released from the Department of Justice’s case files show a host of powerful figures within Epstein’s circle—ranging from Howard Lutnick to Bill Clinton. Bill Gates is among them.

Upon arriving at Capitol Hill, Bill Gates spoke to reporters, stating, “I am pleased to testify here voluntarily to assist the committee in its work.” He added that he would begin his testimony with an opening statement.

Gates said, “I hope my testimony will aid the committee in the important work it is doing to ensure justice for the victims.”

According to an earlier CNN report, the most sensational elements of the previously released documents were two draft emails from July 2013. It is believed that Epstein wrote these emails to himself. In those disjointed emails—rife with spelling errors and expressions of resentment—Epstein claimed he had helped Gates engage in sexual encounters with various young women. He even claimed to have arranged medication for Gates to conceal a sexually transmitted disease (STD) from his wife.

It remains unclear who actually drafted those 2013 messages or whether they were ever sent; they were saved in Epstein’s email account and addressed to himself.

The emails suggest a rift had developed in their friendship at the time, though they continued to meet and exchange emails during that period.

In one email, Epstein claimed he had procured medication for Gates—medication needed to deal with the consequences of sexual encounters with Russian women and illicit affairs with married women.

The emails also mention that Gates had asked Epstein for “Adderall” (a brain-stimulating drug) to help him play in bridge tournaments.

Another draft email alleges that Gates tearfully begged Epstein to delete messages regarding the STD. It further states, “You asked me to get you antibiotics so you could secretly give them to Melinda.” There was also a request to delete highly personal and explicit details regarding his (Gates’s) penis.

None of the allegations made in these draft emails have been verified or substantiated.

There is no indication that the messages were ever shared with Gates or anyone else. Furthermore, the Microsoft co-founder has never been charged with any criminal offense related to Epstein.

Bill Gates has strongly denied these claims. A spokesperson for him previously told CNN, “These claims are completely baseless and entirely false.”

Bill Gates’s spokesperson stated, “These documents merely demonstrate Epstein’s desperation. They show the lengths to which he would go to frame and defame Gates out of resentment over their severed relationship. Gates has acknowledged that meeting Epstein was a major error in judgment. However, he has categorically denied any misconduct involving Epstein or his heinous activities. Gates never visited Epstein’s island, never attended any parties with him, and had no involvement in any of Epstein’s illicit dealings.”

Last February, Gates gave an interview to CNN affiliate ‘Nine News’ in Australia, where he was asked about these newly released documents.

In response, Gates said, “It appears Jeffrey wrote the email to himself. The email was never sent, and as you know, it is false. I do not know what his thought process was. However, it reminds me that I regret every moment spent with him. I apologize for that.”

Prior to Gates’s testimony, James Comer, Chairman of the House Oversight Committee, told CNN that there were no set limits on the questions to be asked during Wednesday’s closed-door questioning.