Health and Human Services Secretary Robert F. Kennedy Jr. speaks quietly to President Donald Trump Tom Brenner/The Washington Post/Getty Images

Senior Trump administration health officials spent days devising the delicate rollout of new guidance suggesting a possible link between autism and the usage of acetaminophen , the active ingredient in Tylenol.

But all their careful plotting could not account for one key variable: President Donald Trump.

Trump on Monday steamrolled his health department’s plans to announce a nuanced step toward addressing rising autism rates, seizing on the first possible solution to declare a victory over a scientific question that has captivated him for decades, four administration officials and close advisers said.

“I’ve been waiting for this meeting f

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