This week’s big briefing on autism and Tylenol from President Donald Trump , Robert F. Kennedy Jr. , and other administration officials was even worse than anyone had expected. The announcement, ostensibly intended to promote the unproven link between acetaminophen use and autism and outline what the administration was doing to investigate that and protect Americans, went far further as Trump irresponsibly offered medical advice and repeatedly and falsely suggested that Tylenol and vaccines were a primary cause of autism — despite the fact that those conclusions are not backed by science. Below, a look at some of the most compelling pushback and warnings that have come out in response.

. A new discrediting low for Trump and his public-health officials

Arthur Caplan, the head of the D

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