In her first large staff meeting, the new director of the Centers for Disease Control and Prevention promised Wednesday to advocate for the agency while acknowledging that congressionally funded programs lacked staff and employees were feeling burned out.

Dr. Erica Schwartz also said she wouldn’t hesitate to disagree with U.S. Health Secretary Robert F. Kennedy Jr. if necessary — but said she wouldn’t do so publicly.

Schwartz started at the head of the Atlanta-based federal agency last week, taking the reins from a series of temporary directors. She spoke to CDC employees Wednesday at her first “all hands” staff meeting. The Associated Press heard a recording of the meeting.