On Tuesday, the Department of Health and Human Services reinstated 328 federal employees who were at risk of termination, including those working on coal miners’ “black lung” disease evaluations and those addressing health concerns for 9/11 first responders.

These reinstated employees are affiliated with the National Institute of Occupational Safety and Health (NIOSH), a branch of the Centers for Disease Control and Prevention, dedicated to preventing and managing work-related health issues.

The Trump administration had previously aimed to eliminate a significant portion of NIOSH’s 1,300+ staff as part of a broader initiative to downsize the federal workforce.

In April and May, numerous NIOSH employees received termination letters, although some were temporarily reassigned for specific tasks. A memo from NBC News indicated that HHS’s acting chief human resources officer, Tom Nagy, informed staff on Tuesday about the revocation of those termination notices.

During a House budget hearing on Wednesday morning, Health Secretary Robert F. Kennedy Jr. confirmed that 328 NIOSH employees had been reinstated. Approximately one-third of these employees are based in Morgantown, West Virginia, with another third located in Cincinnati where NIOSH has two facilities.

“Committee Kennedy has worked diligently to preserve key components of NIOSH,” stated a CDC spokesperson. “The Trump administration remains committed to supporting coal miners and firefighters, and under the Secretary’s leadership, NIOSH’s essential services will continue as HHS streamlines its operations. Ensuring workforce health and safety is a paramount concern for the department.”

The Morgantown facility houses the NIOSH Respiratory Hygiene Department, which manages programs that offer free x-rays to detect miners’ “black lungs” or lung damage caused by prolonged exposure to coal dust. A U.S. District Judge in West Virginia mandated HHS on Tuesday to restore the department and continue monitoring coal miners’ health. Representative Riley Moore, R-W.Va., noted during a House Budget hearing that 111 NIOSH employees in Morgantown were reinstated this week.

Among the 328 reinstatements, HHS has also brought back 15 employees within the World Trade Center Health Program, which addresses the treatment of cancer, asthma, post-traumatic stress disorder, and other illnesses linked to 9/11. The program has faced challenges in recent months due to staff layoffs and rehiring, complicating the registration of members and the assurance that their treatments are funded by federal resources.

“Our agents were faced with severe budget cuts, some of which should not have been enforced.

The program resumed processing registrations on May 1, as indicated by an internal email shared with NBC News regarding an extension of the James Zadroga Act, an advocacy group for 9/11 responders and survivors. Benjamin Shebat, the group’s executive director, is seeking more assurance.

“In light of the recent turbulent months, we need a public guarantee from our secretary that such disruptions will not occur again, and that the World Trade Center’s health program will remain unaffected,” Chevat expressed in an email.

In an agency email acquired by NBC News, NIOSH director John Howard mentioned that some positions within the institute are still being eliminated.

“We celebrate those who received reinstatement letters from HHS, while remembering that others have not,” Howard wrote. “I hope we can continue pushing for the return of everyone to NIOSH.”

Howard received his own termination notice in early April but later resumed his role. Bipartisan opposition from Congress members was voiced regarding his dismissal. An internal report of reinstated positions obtained by NBC News indicated that 56 roles in the NIOSH Director’s office were reinstated on Tuesday.

The original NIOSH layoffs were part of a large-scale restructuring intended to consolidate institutions into a new entity referred to as a healthy American administration. Kennedy mentioned on Wednesday morning that he could not share details of the restructuring due to a court order, which temporarily restricts further planning. A U.S. District Judge in San Francisco ordered the Trump administration last week to suspend the government overhaul, noting that any changes may require Congressional approval.