Atlanta, Georgia — Jim O’Neill has been appointed as the acting director of the Centers for Disease Control and Prevention (CDC) following the recent ousting of Susan Monarez, a source confirmed. This leadership change comes just one day after Monarez, who had been confirmed by the Senate only weeks earlier, was let go amid rising tensions within the agency.

O’Neill, currently serving as deputy secretary of Health and Human Services, brings experience from his time handling significant reforms at the Food and Drug Administration during the late 2000s. His appointment follows a tumultuous period for the CDC, which has recently seen several high-profile resignations and criticism of its direction under the Trump administration.

Monarez’s termination has drawn legal scrutiny, with her attorney claiming that only the President has the authority to fire her, alleging that she was targeted for opposing specific health directives. This has intensified the scrutiny of the White House’s management of the CDC amid a backdrop of ongoing public health challenges.

The agency, already reeling from layoffs and a shifting leadership dynamic, has also faced backlash over its vaccine policies. Tensions had reportedly risen between Monarez and HHS Secretary Robert F. Kennedy Jr., known for his skepticism towards vaccines. Monarez had been a staunch advocate for vaccination, emphasizing its crucial role in public health.

CDC officials have indicated that the agency’s recent strains include fallout from Johnson’s decisions to remove members from its vaccine advisory panel and what critics call a politicization of health policy. As the CDC contends with ongoing operational challenges, including a recent incident involving gun violence near its headquarters, the need for stable leadership has never been more critical.

A cascade of resignations from top officials, including Chief Medical Officer Debra Houry, has raised alarms about the CDC’s direction and integrity. Houry expressed concerns about the manipulation of scientific data for political ends in her resignation email to staff, urging a commitment to scientific transparency.

The upheaval within the CDC has not gone unnoticed by lawmakers. Democratic and Republican leaders alike have commented on the necessity for scrutiny and oversight regarding the recent departures. Republican Senator Bill Cassidy emphasized the need for accountability, while Democratic Senator Patty Murray has called Kennedy’s approach “dangerous.”

Now, with O’Neill stepping into his new role, he faces the daunting task of navigating a deeply divided public health landscape. Kennedy has described the CDC as “very troubled,” indicating the extent of the challenges ahead. O’Neill’s capacity to steer the agency through these turbulent times will likely be closely monitored as the nation continues to confront ongoing health crises.