FILE - In this Aug. 23, 2020, file photo Food and Drug Administration commissioner Dr. Stephen Hahn speaks during a media briefing in the James Brady Briefing Room of the White House in Washington. Hahn, the head of the agency responsible for approving any COVID-19 vaccine, was summoned to the White House Tuesday, Dec. 1, as an increasingly frustrated President Donald Trump complained that approval hasn't moved faster. (AP Photo/Alex Brandon, File)
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