A federal judge on Monday temporarily blocked federal health officials from cutting the number of vaccines recommended for every child, saying U.S. Health Secretary Robert F. Kennedy Jr. likely violated federal procedures in revamping a key vaccine advisory committee.

The decision halts an order by Kennedy—announced in January—to end broad recommendations for all children to be vaccinated against flu, rotavirus, hepatitis A, hepatitis B, some forms of meningitis, and RSV. Leading medical groups raised alarms that these changes would undermine protections against a half-dozen diseases, prompting the American Academy of Pediatrics to amend a lawsuit they had filed in July, seeking to stop the scaling back of the nation’s childhood vaccination schedule.

Initially focused on Kennedy’s choice to stop recommending COVID-19 vaccinations for most children and pregnant women, the lawsuit was updated as Kennedy made further controversial decisions. The amended complaint requested the court address these additional policy changes, including actions related to the Advisory Committee on Immunization Practices (ACIP), which advises health officials on vaccine recommendations.

Kennedy, a prominent anti-vaccine activist prior to his health official role, had previously dismissed the entire 17-member ACIP in favor of a new group containing several anti-vaccine proponents. Judge Brian E. Murphy, nominated by President Biden, remarked that Kennedy's restructuring likely breached federal laws, putting all decisions made by the new committee on hold.

Health and Human Services spokesman Andrew Nixon stated, 'HHS looks forward to the judge’s ruling being overturned, similar to previous attempts to impede the Trump administration.' ACIP was scheduled for a meeting this week to discuss COVID-19 vaccines and other agendas, but that gathering has since been postponed due to the current status of the committee. Richard Hughes IV, attorney for the AAP, noted, 'How can a committee meet without nearly the entirety of its membership?'