| Portman, Robert | U.S. Senator from Ohio, January 2011-present; Chairman, Permanent Subcommittee on Investigations, Senate Homeland Security and Governmental Affairs Committee, January 2015present |
| Purpura, Michael | Deputy Counsel to the President, December 2018-present |
| Putin, Vladimir | Russian President, May 2012-present |
| Reeker, Philip T. | Acting Assistant Secretary, Bureau of European and Eurasian Affairs, Department of State, March 2019-present |
| Rood, John C. | Under Secretary of Defense for Policy, Department of Defense, January 2018-present |
| Sandy, Mark | Deputy Associate Director for National Security at the Office of Management and Budget, December 2013-present; Acting Director of the Office of Management and Budget, January 2017-February 2017 |
| Sekulow, Jay | Personal attorney for President Trump |
| Shokin, Viktor | Ukrainian Prosecutor General of Ukraine, February 2015-March 2016 |
| Short, Marc | Chief of Staff to Vice President Mike Pence, February 2019present |
| Solomon, John | Author of articles promoting debunked conspiracy theories about the Bidens, Crowdstrike, and the 2016 U.S. election |
| Sondland, Gordon | U.S. Ambassador to the European Union, July 2018-present |
| String, Marik | Acting Legal Advisor, Office of the Legal Advisor, Department of State, June 2019-present |
| Sullivan, John J. | Deputy Secretary of State, Department of State, June 2017-present |
| Taylor, William B., Jr. | Chargé d'Affaires for the U.S. Embassy in Kyiv, Ukraine, June 2019-present |
| "Three Amigos" | Secretary of Energy Rick Perry, Ambassador Gordon Sondland, and Ambassador Kurt Volker |
| Toensing, Victoria | Attorney allegedly working "off the books" for President Trump to obtain information from Ukrainian officials on the Bidens |
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