Robert F. Kennedy Jr. is facing growing criticism from parents and advocates who say his recent comments on autism were misguided.

Kennedy, Hotez says, made a “false statement” in claiming that the scientific community denies that there are any environmental factors at play. “I’ve said to RFK Jr. that there could be an environmental component, but not vaccines, because autism occurs in fetal brain development well before kids ever see vaccines.”

The health secretary was widely condemned this week for remarks he made about autism. One expert shares what's most concerning.