The cancellation plays into fears among scientists who worry that Robert F. Kennedy Jr. will use his position as health secretary to sow doubts about vaccines.

A meeting of a committee which advises the U.S. Food and Drug Administration on vaccine policy has been canceled, a committee member told Reuters. The meeting had been scheduled to take place in March,

The Trump administration has canceled an upcoming meeting of the Food and Drug Administration’s vaccine advisory committee, a move that could complicate efforts to produce flu shots in time for the upcoming season.