President Trump on Monday warned pregnant women to limit the use of Tylenol, reviving a contentious debate over whether its active ingredient —acetaminophen — is linked to autism.

Why it matters: Without providing a body of scientific evidence, Trump and Health Secretary Robert F. Kennedy Jr. made broad assertions about the cause of a condition that affects about 1 in 31 children up to age 8. • They also touted a little-known drug called leucovorin as a way to decrease the symptoms of autism.

Appearing with his top health officials, Trump tried to make good on Kennedy's pledge to uncover the source of autism by September and promoted ongoing research by the National Institutes of Health and other federal agencies. • Trump said the FDA would issue a notice to physicians about the risk

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