At the start of Clinton's first term, Bentsen, OMB Director Leon Panetta, Secretary of Labor Robert Reich, and policy coordinator Robert Rubin were Clinton's top economic advisers. After experiencing difficulty with these nominations, as well as that of Lani Guinier, Clinton brought in David Gergen, who had previously served in Republican administrations, to serve as Counselor to the President. Secretary of Defense Les Aspin resigned in the aftermath of the Battle of Mogadishu, and was succeeded by William Perry.