On May 8, 2018, Trump fired Rear Adm. Tim Ziemer, who was serving on the National Security Council as the Director of Global Health Security. In that position, Ziemer was responsible for coordinating responses to global health emergencies and potential pandemics. Ziemer was praised as "one of the most quietly effective leaders in public health" — his work on malaria during the Obama administration was credited for saving millions of lives.
Instead of replacing Ziemer, Trump eliminated the position. Dr. Luciana Borio, the National Security Council director for medical and biodefense preparedness, left the same month and was not replaced.