When Warren Christopher became Secretary of State under President Bill Clinton, Donilon worked as his chief of staff and as Assistant Secretary of State for Public Affairs, from 1993 to 1996. In those posts, he traveled to more than 50 countries. According to the Washington Post, in the Clinton administration, Donilon was "intimately involved in many major foreign policy issues, including negotiating the Bosnian peace agreement and the expansion of NATO." During the Srebrenica massacre, Donilon advocated intervention and lobbied members of Congress and worked with allies to approve intervention.