US President Donald Trump on Monday was expected to tout a tenuous relationship between autism risk and Tylenol use during pregnancy, as scientists urged research on the topic was not conclusive.

Identifying the cause of autism — a complex condition connected to brain development that many experts believe occurs for predominantly genetic reasons — has been a pet cause of Trump’s controversial health chief Robert F. Kennedy Jr.

Earlier this year, Kennedy — well-known for his anti-vaccine views and penchant for conspiracy theories — vowed he would release findings regarding autism’s cause by September 2025.

Trump teased the forthcoming announcement, scheduled for 4:00 pm local time (2000 GMT), as “one of the most important news conferences I’ll ever have.”

“I think we found an answer to

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