Karen Brevard Stewart (born 1952) is an American diplomat who is the current United States Ambassador to the Marshall Islands.
 She was nominated by President Barack Obama to be United States Ambassador to the Marshall Islands on November 5, 2015 was confirmed by the U.S. Senate on May 17, 2016.
 Stewart also served as United States Ambassador to Belarus from August 14, 2006 to March 12, 2008 and as United States Ambassador to Laos from November 2010 to August 2013.
Luis E. Arreaga-Rodas (born 1952) is a Guatemalan American diplomat and government official who has been confirmed as the next United States Ambassador to Guatemala.
 He previously served as United States Ambassador to Iceland from 2010 until 2013.
 In January 2016, he was appointed Principal Deputy Assistant Secretary of State for the Bureau of International Narcotics and Law Enforcement Affairs.
 In June 2017, President Donald Trump nominated Arreaga to become the United States Ambassador to Guatemala.
 This nomination was confirmed by the U.S. Senate on August 3, 2017.
The 2006 United States Senate election in New York was held November 7, 2006.
 Incumbent Democratic U.S. Senator Hillary Rodham Clinton won, by a more than two-to-one margin, a second term representing New York in the United States Senate.
 Clinton was challenged by Republican John Spencer, a former Mayor of Yonkers, New York.
 Spencer won his party nomination by defeating former national security staffer K. T. McFarland in a primary.
Tulinabo Salama Mushingi (born August 4, 1956) is an American diplomat who currently serves a joint appointment as United States Ambassador to Senegal and United States Ambassador to Guinea-Bissau.
 He previously served as the United States Ambassador to Burkina Faso from 2013 to 2016.
 He also served in the executive offices of Secretaries of State John F. Kerry and Hillary Clinton.
 In February 2017, President Donald Trump nominated Mushingi to serve concurrently as United States Ambassador to Senegal and United States Ambassador to Guinea-Bissau.
 Mushingi had originally been nominated for the position by outgoing President Barack Obama in January 2017.
 When Trump took office, he withdrew Mushingi's nomination before renominating him for the same position.
 He was confirmed by the United States Senate by voice vote on May 18, 2017.
John Rufus Gifford (born August 5, 1974) is an American diplomat.
 He served as the United States Ambassador to Denmark from 2013 to 2017, and was the Finance Director for Barack Obama's presidential re-election campaign in 2012.
 On August 1, 2013, Gifford's nomination from President Obama to be the next United States Ambassador to the Kingdom of Denmark was confirmed by the United States Senate.
 He was sworn into the role on August 15, 2013, and presented his credentials to the Queen of Denmark on September 13, 2013.
Harry Keels Thomas Jr. (born June 3, 1956 in the Harlem section of New York City) is an American diplomat and current United States Ambassador to Zimbabwe.
 He served as the United States Ambassador to the Philippines from 2010 to 2013.
 A former United States Ambassador to Bangladesh (serving from 2003 to 2005) and Director General of the United States Foreign Service (serving from 2007 to 2009), Thomas was designated by US President Barack Obama on November 19, 2009 to replace Kristie Kenney as Ambassador to the Philippines—the first African American to serve at that post.
 He was confirmed by the United States Senate on March 19, 2010 and presented his credentials to Philippine president Gloria Macapagal-Arroyo on April 27, 2010 He was then nominated and confirmed as the United States Ambassador to Zimbabwe on October 22, 2015.
 He was sworn in on December 8, 2015.
Nina Marie Fite is an American diplomat and a career member of the Senior Foreign Service.
 Currently serving as Principal Officer at the U.S. Consulate General in Montreal, Canada, she has been nominated by President Donald Trump to become the next United States Ambassador to Angola.
 Since becoming a diplomat in 1990, Fite has served at seven U.S. overseas missions.
 Fite's diplomatic assignments have included posts in Lahore as Consul General, in Kabul as Deputy Economic Counselor, and in Luanda as the Political/Economic Section Chief.
 She has also been on assignment with the Office of the United States Trade Representative.
Michael Arthur Raynor (born 1962) is an American Foreign Service Officer specializing in relations with Africa.
 He has been confirmed by the United States Senate as the next United States Ambassador to Ethiopia.
 He previously served as the Director of the Office of Career Development and Assignments in the Bureau of Human Resources of the United States Department of State.
 Raynor served as United States Ambassador to Benin from 2012 to 2015 after being nominated by President Barack Obama and confirmed by the U.S. Senate.
 Prior to his post in Benin, he was deputy executive director and then executive director of the Bureau of African Affairs.
Edward Masso is a United States Naval officer and businessman who has been nominated by President Donald Trump to become the next United States Ambassador to Estonia.
 He is the founder and president of Flagship Connection, a consulting company focused on business development, strategic planning, and operations analysis in the areas of missile defense, cyber security, and data analytics.
 During his 32-year career in the U.S. Navy, he held nine command assignments, including Commander, Navy Personnel Command/Deputy Chief of Naval Personnel.
 He has served in NATO and the United States European Command.
 Masso is a senior fellow at the Potomac Institute for Policy Studies in cyber security.
Kathleen Troia "K.T." McFarland (born July 22, 1951) is an American government official and commentator who is the nominee to become the next United States Ambassador to Singapore.
 McFarland served as Deputy National Security Advisor to President Donald Trump during the first months of 2017.

Question: What country is the man, with whom John Spencer beat in a 2006 primary, slated to become the next United States Ambassador for?
Answer: Singapore