Overview
- President Trump signed an executive order on Monday directing HHS to propose splitting the combined MMR vaccine into separate single‑disease shots and urging DOJ involvement to press states to adopt the changes.
- On Sunday, Republican Sen. Bill Cassidy publicly condemned the order and the president’s vaccine remarks as "crazy, stupid," saying the policy would force families into more doctor visits, higher costs, and likely lower vaccination rates.
- Medical groups and vaccine researchers say there is no scientific reason to split MMR and no evidence linking vaccines to autism, and they have criticized the administration’s rationale.
- Practical barriers include a lack of U.S. single‑disease MMR products, the need for manufacturers to make new doses, FDA review and new supply chains, and experts warn that spacing shots raises the risk of missed doses and outbreaks.
- The dispute has widened GOP divisions because Cassidy helped confirm HHS Secretary Robert F. Kennedy Jr. and says assurances about preserving vaccine advisory processes were not kept, leaving implementation legally and politically uncertain.