Former FDA Commissioner Scott Gottlieb said Robert F. Kennedy Jr. should not lead the US health agencies, underscoring the risk of further eroding faith in vaccines.

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The potential rift underscores the ways Trump’s health nominees, and their priorities, are shaking up Congress’ policy and budget fault lines.

Robert F. Kennedy Jr. petitioned the FDA to revoke its authorization for the Covid-19 vaccine just six months after it was made available.

Robert F. Kennedy Jr. petitioned the F.D.A. to revoke authorization of the shots at a time when they were in high demand and considered life-saving.