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.

While anti-vaxxers are thrilled, experts warn that defunding mRNA development takes away our already-proven best weapon against future pandemics.

This includes terminating awards and contracts with pharmaceutical companies and universities and canceling 22 investment projects worth nearly $500 million. While some final-stage contracts will be allowed to be completed, no new mRNA-based projects will be initiated, the HHS said.