Kennedy Jr., an ardent vaccine critic who would have been Weldon’s boss as health secretary. Perhaps Weldon’s biggest problem was that he said the quiet part out loud. During his confirmation hearings,

The Infectious Disease Society of America says there have been “no deaths related to the measles, mumps and rubella vaccine in healthy individuals.” (Since the 1970s, the measles vaccine has been given in a combination shot with mumps and rubella to minimize the number of injections kids get.)

ABC News' Melissa Adan reports on the controversial comments from Health and Human Services Secretary Robert Kennedy Jr. on how to prevent the disease.