Barack Obama is the latest to have reacted to Donald Trump’s astounding claim that Tylenol is to blame for the increase in autism diagnoses in the US over the past few decades.

It was at Sunday’s memorial for political activist Charlie Kirk that the current POTUS teased a bombshell announcement to come on Monday. “I think we found an answer to autism,” Trump told the tens of thousands in attendance at State Farm Stadium in Glendale, Arizona.

His detractors around the world likely rolled their eyes in that moment, wondering what would come from the press conference scheduled for the following day. Trump promised it would be “one of the most important news conferences” he ever had.

Whether that’s true or not only time will tell, but it was certainly one of the most controversial, and that – as it relates to Trump – says a hell of a lot.

Flanked by RFK Jr., U.S. Department Secretary of Health and Human Services, Trump outlined a clear link between acetaminophen (known by its brand name, Tylenol) and autism in children.