Kennedy won Senate confirmation to his job, in part, by promising not to change the nation’s vaccine schedule. Since taking office, he’s promised to “investigate” children’s shots, canceled meetings of expert vaccine advisers and directed officials to look again for connections between vaccines and autism, a link long-ago debunked.

Novavax stock was climbing again on Monday after the company expressed new confidence in the eventual approval of its Covid-19 vaccine. The shot has been caught up in the turbid health politics of the second Trump administration.