A resurfaced video of RFK Jr. from 2023 shows him falsely linking the polio vaccine to other diseases. Ari Melber fact checks the heath secretary's claims.

Critics say Kennedy is ordering a review of childhood vaccines to stoke skepticism, risking the spread of disease.

Critics fear that U.S. Department of Health and Human Services chief RFK, Jr., known for his antivaccine views, has picked a crucial CDC committee that will be a “disaster for public health”