It is crucial to oppose the nomination of Robert F. Kennedy Jr. as Secretary of Health and Human Services because his history of promoting vaccine misinformation and conspiracy theories directly undermines public health and trust in science. The HHS Secretary must lead with evidence-based policymaking to protect the health and safety of all Americans, particularly in combating preventable diseases and addressing healthcare inequities. Appointing someone with a track record of spreading falsehoods would erode public confidence in critical health initiatives and jeopardize the progress we have made in advancing public health. Further, his lack of experience and and leadership places some of our MOST important programs, like Medicare and Medicaid, at risk for gross mismanagement.