Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, listens during a Senate Appropriations Subcommittee hearing Wednesday, May 26, 2021, on Capitol Hill in Washington. (Stefani Reynolds/Pool via AP)

In this May 13, 2021 file photo, President Joe Biden speaks in the Roosevelt Room of the White House in Washington. Biden is asking U.S. intelligence agencies to “redouble” their efforts to investigate the origins of the COVID-19 pandemic. After months of minimizing the possibility that the coronavirus emerged from a lab accident, the administration is responding to both U.S. and world pressure for China to be more open about the outbreak. Biden said Wednesday there is insufficient evidence to conclude “whether it emerged from human contact with an infected animal or from a laboratory accident.” (AP Photo/Evan Vucci)

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, and Diana Bianchi, director of the Eunice Kennedy Shriver National Institute of Child Health and Human Development, speak after a Senate Appropriations Subcommittee looking into the budget estimates for National Institute of Health (NIH) and the state of medical research, Wednesday, May 26, 2021, on Capitol Hill in Washington. (Stefani Reynolds/Pool via AP)

FILE - In this Thursday, May 20, 2021 file photo, President Joe Biden speaks in the Cross Hall of the White House in Washington. Biden is asking U.S. intelligence agencies to “redouble” efforts to investigate the origins of the COVID-19 pandemic. He says there is insufficient evidence to conclude “whether it emerged from human contact with an infected animal or from a laboratory accident.” (AP Photo/Evan Vucci)