Former CDC Director Susan Monarez testified before the Senate Health Committee describing her abrupt firing after refusing to endorse vaccine guideline changes without scientific evidence, including proposed delays in newborn hepatitis B vaccination. Monarez and former CDC Chief Medical Officer Debra Houry detailed political interference under Health Secretary Robert F. Kennedy Jr., who allegedly demanded pre-approval for vaccine recommendations or resignations. The turning point threatens to undermine established public health vaccination programs, risking resurgence of preventable diseases.