House Speaker Nancy Pelosi, D-Calif., receives a Pfizer-BioNTech COVID-19 vaccine shot from Brian Monahan, the attending physician for the U.S. Congress, last week.

Speaker of the House Nancy Pelosi, D-Calif., receives a Pfizer-BioNTech COVID-19 vaccine shot by Dr. Brian Monahan, attending physician Congress of the United States in Washington, Friday, Dec. 18, 2020. (Anna Moneymaker/The New York Times via AP, Pool)