"Fauci's resignation will not prevent a full-throated investigation into the origins of the pandemic," Paul tweeted. "He will be asked to testify under oath regarding any discussions he participated in concerning the lab leak."
Paul's tweet arrived amid an announcement from Fauci that he would retire in December after 54 years with the National Institute of Allergy and Infectious Diseases.
The Kentucky senator's comments were further echoed in an announcement from Rep. James Comer, R-Ky., ranking member on the House Committee on Oversight and Reform.
Comer further stressed that Fauci's retirement "can't shield" him from congressional oversight.
"Emails obtained by Oversight Committee Republicans reveal what Dr. Fauci said publicly about COVID origins was very different than what was said privately. Dr. Fauci was warned by top scientists early on that the virus looked genetically manipulated and likely leaked from the Wuhan lab," Comer wrote.
"Despite these facts, Dr. Fauci dismissed these ideas in public as conspiracy theories. We need to know if Dr. Fauci concealed anything from government officials in order to shield the NIH's cozy relationship with EcoHealth Alliance, a grantee that awarded taxpayer funds to the Wuhan lab to conduct dangerous research on bat coronaviruses."
Other Republicans further chimed in. Eric Schmitt, who is running for U.S. Senate in Missouri, explained to Fauci on Twitter to "clear your 2023 calendar for Senate hearings that will focus on your lies and deceit that destroyed lives and livelihoods."
Indiana Rep. Jim Banks tweeted: "Republicans must remain committed to holding Fauci accountable even after he steps down to make sure no one in his position ever abuses the public trust again."
Paul, who is pursuing another term in the Senate, encounters Democrat Charles Booker in the Nov. 8 general election.
Public health specialists announced a hard look needs to be taken at the totality of the U.S. response to the pandemic across both the Trump and Biden administrations, yet without getting into partisan finger-pointing.
"If you want to have a hearing, you need it to be a credible one. And that has to have a purpose. Other than going out to an 81 year old man," stated Georges Benjamin, executive director of the American Public Health Association.
Benjamin has been among the health advocates pushing for an independent commission modeled on the 9/11 Commission to be formed to examine the pandemic response.
"It should be designed to actually get to the right answers. Until they do that, you know, they're going to continue to politicize it," Benjamin announced.