Robert F. Kennedy Jr. faces backlash as his attorney Aaron Siri's petition to revoke the polio vaccine's approval comes to light. Senate leaders stress vaccine safety and public trust, calling for Kennedy to clarify his stance ahead of confirmation hearings. Critics highlight risks of undermining the polio vaccine, which has greatly reduced polio cases globally. The controversy has ignited scrutiny over Kennedy's health priorities and his relationship with anti-vaccine groups, prompting demands from Senators for clear positions on vaccination safety.