Moncef Slaoui, seen last November in the White House Rose Garden, was a key figure in the Trump administration’s crash program to develop COVID-19 vaccines.

Dr. Moncef Slaoui, vaccine expert, delivers an update on “Operation Warp Speed” in the Rose Garden of the White House in Washington, DC on November 13, 2020. (Photo by MANDEL NGAN / AFP) (Photo by MANDEL NGAN/AFP via Getty Images)