Barack Obama has come out swinging against Donald Trump’s health claims tying Tylenol to autism.

The 44th president also warned of America’s “creeping authoritarian tendencies” in fresh attacks on his successor during an event in London Wednesday.

“We have the spectacle of my successor in the Oval Office, making broad claims around certain drugs and autism that have been continuously disproved,” Obama told the 14,000-strong crowd that had gathered to hear him speak, Politico reported.

Trump, 79, boldly asserted a link between acetaminophen—the active ingredient in Tylenol—and autism in newborn babies on Monday, instructing pregnant women to “tough it out” and avoid the painkilling drug altogether.

Major health organizations and national governments swiftly dismissed his claims, which

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