Health and Human Services Secretary Robert F. Kennedy Jr. on Tuesday denied agreeing not to make changes to a key Centers for Disease Control and Prevention vaccine safety panel, which has caused a significant stir in the public health community.

Sen. Bill Cassidy called for a meeting of a Centers for Disease Control and Prevention vaccine advisory committee set for this week to be postponed, citing a lack of experience among its new appointees.

After weeks of staying mostly quiet about Health Secretary Robert F. Kennedy's remaking an influential committee that advises the federal government on vaccinations, U.S. Sen. Bill Cassidy Monday