Andy Slavitt, senior adviser to the White House COVID-19 Response Team, speaks during a White House briefing on Jan. 27. Slavitt talked with NPR about the vaccine rollout.

In this image from video, Andy Slavitt, senior adviser to the White House COVID-19 Response Team, speaks during a White House briefing on the Biden administration’s response to the COVID-19 pandemic Wednesday, Jan. 27, 2021, in Washington. (White House via AP)