Among the eight people Robert F. Kennedy Jr. announced would make up his new group of outside vaccine advisers to the US Centers for Disease Control and Prevention are an emergency physician who posted Islamophobic commentary on social media and two doctors who were paid to provide expert testimony in trials against a vaccine maker.

Health Secretary Robert F. Kennedy Jr. has upended the certainty that American children will always have cost-free access to lifesaving vaccines.

He has since named eight replacements, at least two of whom are outspoken vaccine skeptics.