By Ahmed Aboulenein
WASHINGTON, July 29 (Reuters) – Anthony Fauci, the former top U.S. infectious disease expert, declined to answer questions at a Senate hearing on Wednesday, invoking his Fifth Amendment right against self-incrimination and accusing Republican Senator Rand Paul of an “unhinged” campaign to see him imprisoned.
“Under the advice of my attorneys, I will invoke my right under the 5th Amendment of the Constitution to refrain from answering your questions,” Fauci told the Senate Homeland Security and Governmental Affairs Committee, which Paul chairs, in his opening statement.
The Kentucky Republican has for years called for Fauci to be indicted and accused him of lying to Congress about whether the National Institutes of Health funded “gain-of-function” research in Wuhan, China, and of helping cover up the origins of COVID-19.
Fauci denies both claims and says he has testified truthfully multiple times before Congress on these issues.
GAIN-OF-FUNCTION RESEARCH
“Given Senator Paul’s obvious obsession with calling for my prosecution, his repeated slanderous comments about me, and recently his publicly releasing my unredacted personal diary aimed at embarrassing and intimidating me,” said Fauci, “the only conclusion I can reach is that the sole reason he is calling me before this Committee is to get me to say something that could vindicate his repeated public pledges that I end up, in his words, ‘behind bars.'”
“Any reasonable person who has followed his unhinged obsession with me would readily come to the same conclusion,” said Fauci, who led the National Institute of Allergy and Infectious Diseases for 38 years and became the face of the U.S. pandemic response.
Gain-of-function research is, broadly, work that modifies a pathogen in ways that could make it more transmissible or dangerous, though scientists disagree over how narrowly the term should be defined.
That disagreement is the crux of the Paul-Fauci dispute: Paul says the NIH funded such work in Wuhan and that Fauci lied when he denied it, while Fauci says the research did not meet the government’s formal regulatory definition.
COVID ORIGINS
COVID-19’s origins remain unresolved. The FBI said in 2023 that a leak from a laboratory in the central Chinese city of Wuhan likely caused the pandemic, a claim China said had “no credibility whatsoever”. The CIA said in January 2025 it had shifted its assessment and concluded a lab leak was likely, but with “low confidence,” while four other U.S. intelligence agencies and the National Intelligence Council believe the virus most likely emerged via natural transmission.
Fauci’s attorney David Schertler called Paul’s pursuit “an obsessive vendetta” and said the accusations “are false and disgraceful, and we will examine all options to hold him accountable.”
Schertler said a 2021 clash between Fauci and Paul triggered “an intense and seemingly pathological course of retribution, revenge, and obsession,” with Fauci.
Paul this week published a 1,141-page tranche of Fauci’s pandemic-era diary entries, spanning December 2019 through December 2022.
“Many entries in Fauci’s daily historical account completely undermine the official narrative that Fauci and other public health officials espoused,” he said in a statement.
A fact-check document provided by a representative of Fauci said the diary entries match what he said publicly at the time. He has said since 2021 he kept an “open mind” that COVID could have leaked from a lab, and spoke publicly in early 2020 about asymptomatic transmission and China’s lack of transparency, the very matters Paul says the diary reveals.
CHRONICLE OF FAUCI’S MEDIA APPEARANCES
U.S. Health Secretary Robert F. Kennedy Jr., an anti-vaccine activist and, like Paul, a frequent critic of Fauci, told Fox News on Monday he handed the files to the senator after finding them on government servers.
Both Kennedy and Paul have signaled Fauci’s testimony could expose him to a perjury charge despite a preemptive pardon from President Joe Biden.
Paul has for years pledged to see Fauci imprisoned.
The entries largely chronicle Fauci’s media appearances and fame. A review of his public record provided by a representative of Fauci shows his positions were consistent with the diary.
The Trump administration issued a policy on Tuesday barring federal funding for “dangerous gain-of-function” research, the category at the heart of the Fauci dispute.
In April, former Fauci adviser David Morens was indicted on charges of concealing federal records about research grants and the origins of COVID, though Fauci was not charged. Biden preemptively pardoned Fauci in January 2025 to guard against “unjustified and politically motivated prosecutions.”
(Reporting by Ahmed Aboulenein; Editing by Caroline Humer and Lincoln Feast)
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