US Federal Judge Blocks Robert F. Kennedy Jr.'s Vaccine Policy Changes

A US federal district court judge blocked vaccine policy changes introduced by Robert F. Kennedy Jr., the 26th Secretary of Health and Human Services, on March 16, 2026, reversing alterations to the childhood vaccine schedule that six medical organizations had challenged as unlawful. Judge Brian Murphy ruled that the government had disregarded scientific methods codified into law and had undermined the integrity of its own actions. The lawsuit was brought by pediatric groups and other medical organizations, who argued the changes were arbitrary and capricious. The ruling marked a significant legal setback for Kennedy, who has used his position at the Department of Health and Human Services to reshape federal vaccine policy since taking office in 2025. Public health experts described the decision as a win for public health, while cautioning that erosion of public trust in vaccines had already taken place before the court intervened.

Kennedy fired all 17 ACIP members in June 2025 The legal dispute centered on Kennedy's overhaul of the Advisory Committee on Immunization Practices, the body within the CDC responsible for recommending which vaccines appear on the childhood immunization schedule. According to the verification log, Kennedy dismissed all 17 sitting ACIP members and replaced them with individuals described as anti-vaccine activists or as lacking relevant scientific expertise. The reconstituted committee then made changes to the childhood vaccine schedule that the six plaintiff medical organizations argued fell outside the bounds of legitimate scientific process. Judge Murphy agreed, finding that the government had failed to follow scientific methods that Congress had written into law. The ruling effectively reversed the decisions made by the Kennedy-appointed ACIP panel, restoring the prior schedule pending further legal proceedings.

The ACIP has operated within the CDC for decades, providing independent expert guidance on immunization policy for the US civilian population. Its recommendations on the childhood vaccine schedule carry significant practical weight because insurers, schools, and public health programs typically follow them. Kennedy, a longtime anti-vaccine activist before his appointment, had signaled his intention to revisit federal vaccine policy as a condition of his political alignment with the Trump administration. The firing of an entire federal advisory committee and its wholesale replacement represented an unusually sweeping use of executive authority over a scientific body.

Health groups scramble despite court victory Despite the favorable ruling, medical organizations and public health experts warned that the legal victory did not fully repair the damage already done to public confidence in childhood immunizations. Reuters reported that experts described the ruling as a win for public health but noted that trust in vaccines had already been undermined during the period when Kennedy's policy changes were in effect. The New York Times reported that health groups were left scrambling in the aftermath of the ruling, suggesting that the legal resolution had not resolved the broader institutional and communications challenges facing the public health community. The six medical organizations that brought the suit, which included pediatric groups, had argued throughout that the changes posed a direct risk to child health by casting doubt on a vaccine schedule built over decades of scientific review. The court's finding that the government acted arbitrarily and capriciously reinforced the plaintiffs' central argument that the ACIP overhaul bypassed established legal and scientific standards.

Ruling tests limits of executive power over scientific agencies The case raised broader questions about the extent to which a cabinet secretary can reshape the membership and output of a federal advisory committee without running afoul of statutory requirements. Judge Murphy's ruling indicated that the administration had crossed a legal line by disregarding scientific methods that Congress had codified, a finding that could constrain future attempts to restructure other expert panels across federal agencies. Kennedy, as the 26th Secretary of Health and Human Services, retains broad authority over HHS and its subordinate agencies, but the ruling signals that courts will scrutinize whether that authority was exercised in accordance with procedural and scientific standards set by law. The decision represented what Reuters characterized as a first-round victory for pediatricians and the medical organizations that challenged the policy, with the broader legal contest over vaccine governance likely to continue. No confirmed information is available on whether the administration plans to appeal the ruling or seek a stay of Judge Murphy's order.