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Top U.S. health officials are due to testify Tuesday before the Senate Health, Education, Labor and Pensions Committee at a hearing on the Covid-19 pandemic that has infected more than 191 million people and killed nearly 4.1 million people.

White House senior medical advisor Dr. Anthony Fauci, who is also the director of the National Institute for Allergies and Infectious Diseases, is expected to join Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, will speak. Dr. Janet Woodcock, Acting Commissioner for the US Food and Drug Administration and Dawn O’Connell, Assistant Secretary for Prevention and Response at the US Department of Health will also speak.

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