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?
John R. Bolton John Robert Bolton (born November 20, 1948) is an American lawyer and diplomat who has served in several Republican administrations. 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. He resigned in December 2006, when the recess appointment would have otherwise ended, because he was unlikely to win confirmation from the Senate in which a newly elected Democratic Party majority would be taking control in January 2007.
Arthur Goldberg Arthur Joseph Goldberg (August 8, 1908January 19, 1990) was an American statesman and jurist who served as the 9th U.S. Secretary of Labor, an Associate Justice of the Supreme Court of the United States, and the 6th United States Ambassadors to the United Nations.