Dr. Scott Gottlieb, then commissioner of the Food and Drug Administration, testifies during a House hearing on in October 2017. In an NPR interview, Gottlieb says he doesn’t expect enough demand for the COVID-19 vaccine much beyond 160 million Americans.

WASHINGTON, DC – OCTOBER 25: Dr. Scott Gottlieb, commissioner of the Food and Drug Administration (FDA), testifies during a House Energy and Commerce Committee hearing concerning federal efforts to combat the opioid crisis, October 25, 2017 in Washington, DC. Lawmakers on the committee threatened to subpoena information from the Drug Enforcement Agency (DEA) regarding their delayed responses about drug distributors that poured in millions of pain pills into West Virginia. (Photo by Drew Angerer/Getty Images)