The move could shift long-standing practices of how and when children are immunized in the United States.

The United States won’t contribute anymore to Gavi, the Vaccine Alliance, until the global health organization has “re-earned the public trust,” U.S. Health Secretary Robert F. Kennedy Jr. said Wednesday.

Kennedy Jr. removed all of its sitting members and appointed new ones. The Advisory Committee on Immunization Practices (ACIP) is expected to vote on vaccine recommendations for the fall as well as discuss other vaccines,