Retired immunologist Anthony Fauci invoked the Fifth Amendment during a heated US Senate hearing focused on his role in the COVID-19 pandemic. The move meant Fauci declined to answer senators' questions as lawmakers revisited decisions made during the public health crisis.

Republicans, including Senator Rand Paul, used the hearing to press Fauci on accusations that he helped obscure the origins of COVID-19. The confrontation reflected a long-running political dispute over how the pandemic was managed and what officials knew about the virus in its early stages.

By invoking constitutional protections against self-incrimination, Fauci avoided direct responses on the issues raised by senators. The hearing therefore centered as much on the legal and political significance of his refusal to testify as on the underlying questions about pandemic policy and accountability.

The episode adds to continuing tensions in Washington over COVID-19, with lawmakers still divided over public health decisions, federal oversight and the debate surrounding the virus's origins. Fauci's appearance kept those arguments in the spotlight, even as many of the core disputes remain unresolved.