Former top US health official Anthony Fauci declined to respond to questions during a contentious US Senate hearing focused on the origins of Covid-19, citing his constitutional right against self-incrimination.

Fauci invoked the Fifth Amendment, which protects individuals from being compelled to testify against themselves in criminal cases. He expressed concern that Republicans might use his testimony to pursue perjury charges.

Despite previous congressional testimony on Covid and its origins, Fauci has faced persistent Republican accusations alleging he concealed information and misled the public about the pandemic. He has consistently denied any wrongdoing, describing such claims as "simply preposterous."

At the hearing, Fauci stated, "Although it pains me to do so because of the respect I have for the legislative branch of government... under the advice of my attorneys, I will invoke my right under the Fifth Amendment of the constitution to refrain from answering your questions."

Fauci was granted a pre-emptive federal pardon by former President Joe Biden covering actions from 2014 to 2025 but could still face legal challenges for activities beyond that period or at state and local levels.

Senate Tensions and Legal Battles

  • Senator Rand Paul, who has repeatedly promoted the lab-leak theory of Covid’s origin, pressed Fauci for answers and called for an apology.
  • Paul also announced plans for a committee vote to hold Fauci in contempt of Congress.
  • During the hearing, Fauci’s lawyer was removed after attempting to interject, highlighting the tense atmosphere.
  • Republicans questioned Fauci on shifting health guidance during the pandemic, which Fauci has defended as evolving with emerging evidence.

Fauci criticized Senator Paul’s approach, suggesting it was driven by a personal vendetta aimed at criminal prosecution. Meanwhile, former President Donald Trump weighed in via social media, branding Fauci "crazy" and reiterating his belief that Covid originated from the Wuhan laboratory.

Ongoing Debate on Covid Origins

The origins of Covid-19 remain hotly debated. The World Health Organization in 2025 identified natural spillover from animals as the most supported theory but deemed the evidence inconclusive pending further investigation.

Fauci’s pandemic-era diary entries released by Paul reveal Fauci’s early openness to both natural and lab-leak theories, though he later leaned toward natural origins while keeping an open mind.

Political Fallout and Investigations

  • Republican Senator Ron Johnson vowed to subpoena Fauci to compel testimony.
  • Florida’s attorney general announced a state-level investigation into Fauci following the hearing.
  • Democrats defended Fauci, with Senator Maggie Hassan describing the hearing as a trap.
  • Fauci has faced death threats during the pandemic and lost security protection last year.

Throughout the pandemic, Fauci was a trusted figure in the US government’s response efforts and received a presidential commendation from Donald Trump in 2021 for his role in the Covid vaccine initiative.