Judge Blocks RFK Jr. From Implementing 'Arbitrary and Capricious' Vaccine Overhaul
One physician and public health expert called the ruling "a much-needed victory for a sane approach to federal vaccine policy that relies on science, not misinformation and conspiracy theories."
In what advocates called a major victory for public health, a federal judge on Monday temporarily blocked US Health and Human Services Secretary Robert F. Kennedy Jr. from implementing a series of moves that critics have warned would weaken childhood immunization efforts and increase the likelihood of serious disease outbreaks.
US District Judge Brian E. Murphy of Massachusetts, an appointee of former President Joe Biden, invalidated Kennedy's reorganized Advisory Committee on Immunization Practices (ACIP) panel, which was set to meet later this week.
Kennedy—who was confirmed by the Senate last year over the objections of tens of thousands experts and despite being a purveyor of vaccine misinformation—replaced ACIP members with several people with ties to the anti-vaccine movement.
Murphy also blocked the committee's unprecedented changes to US immunization recommendations, writing that the "arbitrary and capricious" move stands in stark contrast with the long established decision-making process he called "a method scientific in nature and codified into law through procedural requirements."
“Unfortunately, the government has disregarded those methods and thereby undermined the integrity of its actions," the judge said.
The Department of Health and Human Services (HHS) under Kennedy revised the Center for Disease Control and Prevention's (CDC) childhood immunization schedule so that fewer vaccines are now universally recommended for all children. The agency also reclassified vaccines that were previously endorsed for all children into categories in which vaccination depends on designated risk groups and consultations with medical professionals, among other changes.
Twenty-nine states and the District of Columbia have announced that they would not follow the new CDC immunization recommendations.
Lookie Here! As of now, 29 states + DC, have announced that they are no longer going to follow CDC's recommendations for some or all childhood vaccines.Kennedy is not restoring public trust in science as he said he would. 🧪 www.kff.org/other-health...
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— Princess Vimentin PhD | Cancer Biologist (@princess-vimentin.bsky.social) March 12, 2026 at 11:47 AM
Plaintiffs' attorney Richard Huges IV said in a statement that "this ruling is a momentous step toward restoring science-based vaccine policymaking."
"The judge recognized that the actions of Secretary Kennedy and the Advisory Committee on Immunization Practices are not grounded in science and that they are destructive," he added. "We are thrilled that the court has discarded the baseless vaccine schedule changes made by Secretary Kennedy and is blocking the Advisory Committee on Immunization Practices from doing further damage to vaccine policy."
Dr. Robert Steinbrook, Health Research Group director at Public Citizen, said in response to the ruling that "Judge Murphy’s decision is a much-needed victory for a sane approach to federal vaccine policy that relies on science, not misinformation and conspiracy theories."
"Kennedy’s hand-picked ACIP has been a national embarrassment, thoroughly lacking in the ability to make careful fact-based decisions," he added. "The judge’s ruling offers a responsible path forward for public health and evidence-based federal vaccine policy.”
RFK Jr. fired all of the legitimate scientific experts on the Advisory Committee on Immunization Practices and replaced them with unqualified political appointees.A judge just ruled that the new members were not appropriately appointed, so ACIP cannot meet this week to spread more misinformation.
— Elizabeth Jacobs, PhD (@elizabethjacobs.bsky.social) March 16, 2026 at 1:38 PM
Anthony Wright, executive director of the advocacy group Families USA, said in a statement: "When politics override science, our children pay the price. Today’s decision helps ensure that medical evidence—not ideology—guides how we protect kids from preventable diseases."
Wright continued:
Secretary Kennedy’s attempt to remove universal recommendations for routine vaccinations only increased confusion among medical providers and families. The routine vaccines being questioned by HHS are the product of centuries of rigorous science and medicine and are why children today don’t die from measles or suffer the lifelong consequences of diseases we long ago learned to prevent. For a country as large, diverse, and mobile as ours, universal vaccine recommendations are the safest and most effective way to stop outbreaks before they start.
Amid several recent outbreaks, public health officials warned late last year that the United States is close to following Canada in losing its measles elimination status, a deadly and preventable setback many experts attribute to HHS' vaccine-averse policies and practices under Kennedy.
"We commend the court for this ruling, but families should not have to depend on litigation to ensure their child can receive a routine vaccine," Wright said. "Evidence-based medicine keeps children alive and in school. Preventing disease should be the foundation of any healthcare system serious about confronting the next disease outbreak or finding the next cure."
The group Protect Our Care called the decision "a major step in the right direction for children’s health after many setbacks under this administration."
“Most Americans, most states, and now a federal court have rejected the [President Donald] Trump-RFK Jr. scheme to make preventable disease great again among American children while exploding health costs across the country," Protect Our Care president Brad Woodhouse said. "While this ruling is a reprieve from harmful anti-vaccine policy based on nothing but junk science and discredited conspiracies, it’s clear the Trump administration is determined to resuscitate their agenda in a higher court because they care more about their anti-science agenda than keeping kids healthy.”
Indeed, HHS spokesperson Andrew Nixon said the agency "looks forward to this judge’s decision being overturned just like his other attempts to keep the Trump administration from governing.”
Public health advocates noted the limitations of judicial rulings.
"The courts can only do so much without Congress, which must fulfill its oversight responsibility and rein in an executive branch that is taking an axe to core public health protections," Wright said. "Transparency and scientific integrity are not optional, especially when children’s lives are at stake. Families deserve vaccine policy grounded in evidence and expert guidance—not ideology or personal bias—with the goal of making sure every child in America can grow up healthy.”
