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.”

As much as the current administration would like folks to believe there is something larger at play, the rise in autism diagnoses can be easily explained.

RFK Jr., the head of HHS, said the agency is taking on a "massive testing and research effort" to determine the cause of autism. Here's what to know.