David Wurmser served as special assistant at the State Department to a diplomat that was appointed  U.S. ambassador to the United Nations by what president?
David Wurmser:  He served as Middle East Adviser to former US Vice President Dick Cheney, as special assistant to John R. Bolton at the State Department and as a research fellow on the Middle East at the American Enterprise Institute (AEI). John R. Bolton:  Bolton served as the U.S. ambassador to the United Nations from August 2005 until December 2006 as a recess appointee by President George W. Bush.
George W. Bush