Next slide, please: Inside wonky White House virus briefings
In this March 19, 2021, photo, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, leads President Joe Biden into the room for a COVID-19 briefing at the headquarters for the CDC Atlanta. Walensky is making an impassioned plea to Americans not to let their guard down in the fight against COVID-19. She warned on March 29 of a potential “fourth wave” of the virus. (AP Photo/Patrick Semansky)

In this March 19, 2021, photo, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, leads President Joe Biden into the room for a COVID-19 briefing at the headquarters for the CDC Atlanta. Walensky is making an impassioned plea to Americans not to let their guard down in the fight against COVID-19. She warned on March 29 of a potential “fourth wave” of the virus. (AP Photo/Patrick Semansky)

Mar. 29, 2021 12:32 PM EDT
Jeff Zients, White House COVID Coordinator, listens as Senate Majority Leader Chuck Schumer, D-N.Y. speaks to reporters during a news conference, Friday, March 19, 2021, in New York. Schumer and Zients announce the ramping up of vaccines supplies and delivery in new federal sites and millions of community health centers in New York. (AP Photo/Mary Altaffer)

Jeff Zients, White House COVID Coordinator, listens as Senate Majority Leader Chuck Schumer, D-N.Y. speaks to reporters during a news conference, Friday, March 19, 2021, in New York. Schumer and Zients announce the ramping up of vaccines supplies and delivery in new federal sites and millions of community health centers in New York. (AP Photo/Mary Altaffer)

Mar. 19, 2021 01:18 PM EDT
FILE - In this Jan. 27, 2021, file image from video, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, speaks during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. (White House via AP, File)

FILE - In this Jan. 27, 2021, file image from video, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, speaks during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. (White House via AP, File)

Mar. 30, 2021 05:05 PM EDT
President Joe Biden, standing left, visits a COVID-19 vaccination site with Secretary of Veterans Affairs Denis McDonough, right, and White House COVID-19 Response Coordinator Jeff Zients, center, at the VA Medical Center in Washington, Monday, March 8, 2021, as Pharmacist Deepika Duggineni, seated, prepares a vaccine. (AP Photo/Patrick Semansky)

President Joe Biden, standing left, visits a COVID-19 vaccination site with Secretary of Veterans Affairs Denis McDonough, right, and White House COVID-19 Response Coordinator Jeff Zients, center, at the VA Medical Center in Washington, Monday, March 8, 2021, as Pharmacist Deepika Duggineni, seated, prepares a vaccine. (AP Photo/Patrick Semansky)

Mar. 08, 2021 01:43 PM EST
FILE - In this Jan. 27, 2021, file image from video, Jeff Zients, White House coronavirus response coordinator, speaks as Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases and chief medical adviser to the president., Dr. Marcella Nunez-Smith, chair of the COVID-19 health equity task force, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, and Andy Slavitt, senior adviser to the White House COVID-19 Response Team,, appear on screen during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. (White House via AP, File)

FILE - In this Jan. 27, 2021, file image from video, Jeff Zients, White House coronavirus response coordinator, speaks as Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases and chief medical adviser to the president., Dr. Marcella Nunez-Smith, chair of the COVID-19 health equity task force, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, and Andy Slavitt, senior adviser to the White House COVID-19 Response Team,, appear on screen during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. (White House via AP, File)

Mar. 30, 2021 05:05 PM EDT