Moderna Inc. shares are selling off Wednesday, after the Trump administration took aim at the science behind the biotechnology company’s vaccines and said it would cancel some contracts and stop funding mRNA drug development.

This was one in a continuing line of moves that have put Kennedy's vaccine skepticism into public policy, though scientists say the vaccines are safe.

US Health and Human Services is “winding down” its mRNA vaccine development and will instead fund other vaccine platforms through the Biomedical Advanced Research and Development Authority, the agency said Tuesday.