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Officials from the National Institutes of Health testified before Congress Tuesday the agency’s annual budget as the nation battles the Covid-19 pandemic.

Witnesses include the White House Chief Medical Officer, Dr. Anthony Fauci, who also directs the National Institute for Allergies and Infectious Diseases within the NIH, and directors of the country’s top medical institutions.

NIH Director Dr. Francis S. Collins also testifies before the House Committee on Appropriations and the Subcommittee on Labor, Health and Human Services, along with Dr. Diana W. Bianchi, the director of the National Institute for Child Health and Human Development by Eunice Kennedy Shriver.

Other witnesses are Dr. Gary H. Gibbons, the director of the National Heart, Lung, and Blood Institute; Dr. Norman E. Sharpless, the director of the National Cancer Institute, and Dr. Nora D. Volkow, the director of the National Institute on Drug Abuse.

Read CNBC’s live updates for the latest news on the Covid-19 outbreak.

Correction: This article has been updated to reflect the spelling of Dr. Correct Norman Sharpless.