Senate Democrats have opened a formal investigation into Health Secretary Robert F. Kennedy Jr.'s sweeping changes to federal vaccine policy, focusing on his controversial overhaul of the Advisory Committee on Immunization Practices (ACIP). In a letter sent Monday, Sens. Ron Wyden (D-Ore.) and Maggie Hassan (D-N.H.) demanded Kennedy produce internal communications and documents detailing who in the Trump administration authorized the panel's restructuring and assessed its legal and public health implications.
The inquiry zeroes in on Kennedy's decision last year to fire all 17 sitting ACIP members and replace them with allies known for vaccine skepticism. The senators argue this move undermines the panel's scientific integrity and public trust. “The American people deserve to know the reasons that the administration decided to gut ACIP and whether that decision was based on the political and personal agendas of a small group of vaccine cynics who you and President Trump sought to appease,” Wyden and Hassan wrote.
During a Senate Finance Committee hearing in April, Kennedy told lawmakers that President Trump and senior White House officials personally approved his decision to terminate the ACIP members—contradicting his earlier claims of unilateral action. The senators seized on this discrepancy, stating, “This was not a routine personnel action. It was the deliberate dismantling of the nation’s vaccine advisory body, replaced with your handpicked allies, several of whom have built careers, and earned profits, undermining the very vaccines they are now charged with evaluating.”
The letter sets a July 17 deadline for the records, signaling a broader oversight push by Democrats as they eye potential gains in the midterm elections. If they reclaim control of either chamber, similar investigations into the Department of Health and Human Services (HHS) are likely. The probe also highlights ongoing Democratic focus on Kennedy's vaccine policies, which have been linked to declining vaccination rates and a resurgence of preventable diseases like measles.
Public opinion polls consistently show Americans oppose limiting vaccine access or altering immunization schedules, yet Kennedy has pressed ahead with changes that the White House has tried to keep low-profile ahead of the November elections. Meanwhile, a federal court has blocked Kennedy's ACIP overhaul, ruling that the administration acted unlawfully. All vaccine-related work by the panel remains frozen as HHS appeals the decision.
The investigation comes as healthcare costs continue to strain families, with recent polls showing half of U.S. adults struggle to afford medical care. Democrats are also advancing a drug pricing plan to counter Trump ahead of the midterms, while the administration faces scrutiny over its handling of global health crises. The outcome of this probe could reshape vaccine policy and public health oversight for years to come.
