The U.S. Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices (ACIP) has encountered turmoil amid votes and discussions on vaccinating newborns against hepatitis B and changes to the MMRV vaccine recommendations. Former CDC Director Susan Monarez testified that Health Secretary Robert F. Kennedy Jr. demanded pre-approval of all ACIP recommendations or her resignation, leading to her ouster and subsequent resignations at CDC. The panel postponed the hepatitis B vaccine dose delay vote due to data ambiguities, raising concerns about public health implications and undermining established vaccine guidance processes.