House Oversight Committee Chair James Comer (R-KY) demanded Thursday that the National Archives and Records Administration (NARA) hand over all documents and communications in which then-Vice President Joe Biden used pseudonyms such as "Robert Peters," "Robin Ware," and "JRB Ware."

Comer listed the pseudonyms in a letter to NARA in which he demanded access to then-Vice President Joe Biden's documents and communications regarding official duties that overlapped with his son's activities in Ukraine.

One email, which Comer says the committee has already seen, includes an attachment with the vice president's schedule, indicating that he had spoken by phone to then-Ukrainian President Petro Poroshenko. The email was sent to a "Robert L. Peters" and cc'ed to the vice president's son, Hunter Biden.

Joe Biden was the designated foreign policy point person to Ukraine during the Obama administration. The House Oversight Committee argues that Joe Biden threatened to withhold U.S. aid to Ukraine in 2015 until the president of Ukraine fired prosecutor Viktor Shokin, who had jurisdiction for an investigation into the Ukrainian energy company Burisma Holdings.

Burisma paid Hunter Biden $83,000 a month for a board position to obtain the Biden "brand," as Biden business associate Devon Archer described the arrangement.

Years later, in 2018, Joe Biden bragged about the firing of Shokin, which he pushed for during an official visit to Ukraine in 2015.

"I said, 'I'm telling you, you're not getting the billion dollars.' I said, 'you're not getting the billion. I'm going to be leaving here in, I think it was about six hours,'" Biden told the audience. "I looked at them and said, 'I'm leaving in six hours. If the prosecutor is not fired, you're not getting the money.' Well, son of a bitch. He got fired."