Trump has regularly promoted suspicion about vaccines causing autism going back to before he ran for president in 2015. In 2014, he tweeted, “Healthy young child goes to doctor, gets pumped with massive shot of many vaccines, doesn't feel good and changes - AUTISM. Many such cases!”

Trump is insisting he isn’t against vaccines while also echoing Kennedy’s unfounded concerns. Here’s the latest on their comments and plans.

Researchers attribute a rise in autism diagnoses to increased screening and changing definitions of the condition. Hundreds of studies have found childhood vaccines to be safe.