In a White House press conference Monday, President Trump and several deputies said the Food and Drug Administration would be updating drug labelling to discourage the use of acetaminophen by pregnant women, suggesting a link between the common painkiller and autism.

Federal officials also said they would also be changing the label for leucovorin, a form of vitamin B typically used in conjunction with cancer treatment, to enable its use as a treatment for autism. And they added that state Medicaid programs, in partnership with the federal Centers for Medicare and Medicaid Services, would cover this use.

The suite of changes were announced despite a notable lack of clear scientific evidence to support these moves. They were presented as part of what the administration said was its commitm

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