Senate Majority Leader John Thune (R-S.D.) says he’s “very concerned” about controversial claims by President Trump and Secretary of Health and Human Services Robert F. Kennedy, Jr. that Tylenol, a common over-the-counter pain medication, is linked to “very increased risk of autism,” despite the lack of clear scientific evidence showing a causal relationship.

“I’m obviously very concerned about that. I am a father and a grandfather and just have, as of about seven months ago, a newborn........

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