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.
Susan P. Coppedge Susan P. Coppedge is an American attorney and diplomat, currently serving as United States Ambassador-at-Large to Monitor and Combat Trafficking in Persons. She was nominated by President Barack Obama and confirmed by the Senate Oct. 8, 2015. In this role, she advises the United States Secretary of State and the Under Secretary of State for Civilian Security, Democracy, and Human Rights directly and formulates U.S. policy on human trafficking. As the head of the Office to Monitor and Combat Trafficking in Persons, she also has the rank of Assistant Secretary.