Anthony Fauci is set to testify before a Senate committee on July 29, 2026, as part of a Republican-led investigation into where Covid-19 came from, including the idea that it accidentally leaked from a lab. The committee's chairman, Senator Rand Paul of Kentucky, has led the investigation and, the night before the hearing, released more than 1,000 pages of Fauci's pandemic diary entries and work notes The Hill.

Fauci was the director of the National Institute of Allergy and Infectious Diseases for 38 years before retiring in 2022. That agency is part of the federal government's system for studying and fighting infectious diseases. He advised both Donald Trump and Joe Biden on the Covid-19 pandemic, which made him a central figure in the government's response across two presidencies. His testimony places him before a senator who has spent years challenging his public statements about where the pandemic started and how federal research money was spent.

The diary release has already revealed specific details. Fauci organized a phone call with top scientists on February 1, 2020, to discuss where COVID-19 came from, according to his own journal entries ABC News. In that journal, Fauci wrote that the scientists did not agree with each other about the virus's origins during the call. That disagreement, now public, will likely be a focus of questioning about whether Fauci shared that uncertainty with the public or kept it quiet.

Fauci is expected to deny claims that he covered up the origins of the pandemic, according to reporting ahead of the hearing Washington Post. The hearing also takes place against a broader policy backdrop. The White House published a report on the lab-leak theory in April 2025, which it used as a reason to cut funding to the National Institutes of Health, the federal government's main medical research agency. The FBI stated in 2023 that a leak from a laboratory in Wuhan, China, likely caused COVID-19 Reuters. Think of it like a prosecutor releasing evidence before a trial: it gives everyone time to study the material and prepare their questions.

The broader context here is a years-long clash between Congress, which has the power to investigate the government, and public-health officials over how transparent they were during a crisis unlike anything in modern memory. Paul's decision to release the diary entries before the hearing, rather than during it, signals an effort to shape the public record and set the narrative before Fauci delivers his testimony. The documents give senators and reporters time to examine specific passages, which means the hearing may be driven less by new discoveries than by how Fauci responds to evidence that has already been circulated. The February 1, 2020 call and the recorded disagreement among scientists are the kinds of details that lend themselves to sharp, specific questioning under oath.

What is at stake goes beyond Fauci's personal reputation. The decision to cut NIH funding was tied to the lab-leak theory, which means that what Congress concludes from this investigation could affect the budgets of the nation's main medical research agencies. The hearing sits at the intersection of scientific debate, government accountability, and live decisions about federal spending.

The hearing is one of several major developments in Washington on July 29, 2026. Donald Trump met with Ukrainian President Volodymyr Zelenskyy and Israeli Prime Minister Benjamin Netanyahu before delivering a eulogy at Lindsey Graham's funeral. The Senate confirmed Jay Clayton as director of national intelligence on or around the same date. The Senate also voted 86 to 12 to advance the "Lindsey O Graham Sanctioning Russia and Iran Act." Zelenskyy told Fox News on July 28 that Trump had agreed to allow Ukraine to manufacture its own Patriot air defense interceptors.

These parallel storylines, from intelligence leadership to sanctions legislation to defense production agreements, all converge on a single day of intense activity in Washington. The Fauci hearing, while narrower in scope than sanctions or intelligence confirmations, feeds into a sustained effort to reshape the federal system that guided the pandemic response.