Longtime government officials in the State Department and National Security Council have been called to testify or produce documents. These officials brought up or dealt with concerns about Trump’s dealings with Ukraine. Two have recently resigned, and Marie Yovanovitch, a 33-year veteran of State, was abruptly removed in the spring as U.S. ambassador to Ukraine.

George P. Kent Deputy assistant secretary of state responsible for Ukraine Involvement: Alleges that he and other career officials were sidelined after a May meeting organized by Mulvaney put Volker, Sondland and Perry in charge of Ukraine policy. Read more Background: In more than 25 years in the Foreign Service, Kent has been the deputy chief of mission in Kyiv and leader of anti-corruption campaign in Europe. He currently oversees policy for several countries including Ukraine. Deposition Did appear Details » Hearing Did appear Details »

Marie “Masha” Yovanovitch Former U.S. ambassador to Ukraine Involvement: Ambassadorship was abruptly terminated in May, allegedly after direct pressure from Trump and months of complaints from Giuliani. Read more Background: A member of the Foreign Service since 1986, Yovanovitch has served as ambassador to Armenia, Kyrgyzstan and Ukraine. Deposition Did appear Details » Hearing Did appear Details »

Michael McKinley Former senior adviser to Secretary of State Mike Pompeo Involvement: Resigned in October over mistreatment of career U.S. diplomats, particularly Yovanovitch, and pressure placed on Ukraine to investigate Trump's political rivals. Read more Background: A State Dept. senior officer who has held a range of diplomatic posts, including ambassador to Afghanistan, Colombia, Peru and Brazil. Recruited by Pompeo last year as a policy adviser and a conduit between his office and the career service. Deposition Did appear Details »

Philip Reeker Acting assistant secretary of European and Eurasian affairs Involvement: Expressed concerns to top State Dept. officials over a smear campaign against former Ukrainian ambassador Yovanovitch and pushed for the department to publicly support her. Read more Background: A career foreign service officer, Reeker has served as ambassador to Macedonia and U.S. counsel general in Milan. Deposition Did appear Details »

William “Bill” Taylor Acting ambassador to Ukraine Involvement: Wrote in text messages with the U.S. ambassador to the E.U. that “it’s crazy” to withhold military aid as leverage. Later testified that military aid and a White House invitation for President Zelensky were conditional on Ukrainian investigations into the Bidens and 2016 election interference. Read more Background: Taylor is a retired former ambassador to Ukraine and foreign policy elder statesman. He is currently acting ambassador to Ukraine, but took the role on as a temporary assignment and is expected to return to his senior position at the U.S. Institute for Peace sometime next year. Deposition Did appear Details » Hearing Did appear Details »

Fiona Hill Former senior official for Russia and Europe on the National Security Council (NSC) Involvement: Expressed concerns to NSC lawyer John Eisenberg about Ukraine shadow policy carried out by Giuliani, Sondland and Volker. Read more Background: Hill joined the NSC in 2017 as a senior director for Europe and Russia and an interagency liaison. She left the job in August. Prior to the NSC, Hill served on the National Intelligence Council from 2006 to 2009 and then worked at The Brookings Institution for over a decade. Deposition Did appear Details » Hearing Did appear Details »

Timothy Morrison Former senior official for Russia and Europe on the National Security Council (NSC) Involvement: Morrison corroborated earlier testimony by acting ambassador Taylor. Morrison had alerted Taylor to a push by Trump and his deputies to withhold both security aid and a White House visit for the Ukrainian president until Ukraine agreed to investigate the Bidens and interference in the 2016 presidential election Read more Background: Morrison served as policy director on the House Armed Services Committee, along with other Congressional positions, before joining the NSC in July 2018 and taking over Fiona Hill's former position. He resigned in October 2019. Deposition Did appear Details » Hearing Did appear Details »

Alexander S. Vindman National Security Council (NSC) director for European affairs Involvement: Vindman attended a meeting between U.S. and Ukrainian government officials where Sondland pushed for Ukraine to investigate the 2016 election and the Biden family in exchange for a meeting with President Trump. He also listened in on the July 25 phone call between Presidents Trump and Zelensky. He reported concerns regarding the meeting and phone call to the NSC's lead counsel. Vindman testified that the transcript of the phone call released by the White House was incomplete, missing references to Biden. Read more Background: A member of the U.S. Army for over two decades, Vindman joined the NSC in July 2018. He's specialized in Eurasian policy for over a decade, working in the Russian and Ukrainian embassies. At the age of three he fled the Soviet Union with his family. Deposition Did appear Details » Hearing Did appear Details »

Catherine Croft Foreign Service officer Involvement: During her time at NSC, lobbyist and former congressman Robert Livingston called Croft multiple times telling her Ambassador Yovanovitch should be fired. She reported the calls to Fiona Hill and George P. Kent. As Volker's adviser, she knew he was in contact with Rudolph W. Giuliani, but not the context of their discussions. Read more Background: Croft has been a Foreign Service officer for the past nine years and has worked on Ukraine since 2013. She served on the NSC from July 2017 to July 2018. In May 2019 she became former special envoy Volker’s adviser, taking over from Christopher Anderson. Deposition Did appear Details »

Christopher Anderson Foreign Service officer Involvement: Anderson testified that in a June 13 meeting National Security Advisor John Bolton cautioned that Rudolph W. Giuliani was a key voice to the President on Ukraine and could be an obstacle to White House engagement. Read more Background: Anderson has served as a Foreign Service officer since 2005 and focused on Ukraine for the last five years. He advised former special envoy Volker from August 2017 to July 2019. Deposition Did appear Details »

John Bolton Former national security adviser Involvement: Christopher Anderson testified that Bolton considered Giuliani, and his influence with Trump, an obstacle to Ukraine policy. Questions are expected to focus on his frustration with Trump’s allies who pressed Ukraine for investigations into the 2016 election and the Biden family. Background: Bolton served various roles in the Reagan, George H.W. Bush and George W. Bush administrations, including ambassador to the United Nations. He was President Trump's national security adviser from April 2018 to September 2019. Deposition Did not appear Details »

Jennifer Williams Special advisor to Vice President Pence on European and Russian affairs Involvement: Williams listened in on the July 25 phone call between Presidents Trump and Zelensky. She also traveled with Pence to Warsaw a month after the call where he stood in for Trump and met with Zelensky. Read more Background: Williams has been with the State Dept. for over 13 years and has been detailed to Vice President Pence since April. Deposition Did appear Details » Hearing Did appear Details »

David Holmes Counselor for political affairs at the U.S. Embassy in Ukraine Involvement: Testified that he overheard a July 26 phone call in which Trump pressed Sondland about whether Ukrainian President Volodymyr Zelensky would “do the investigation.” Sondland replied he would. Read more Background: Holmes has worked for the State Dept. his entire professional career. Previously, he served at the U.S. embassy in Moscow and on the National Security Council. Deposition Did appear Details » Hearing Did appear Details »

Charles Kupperman Former deputy national security adviser Involvement: Kupperman listened in on the July 25 phone call between Presidents Trump and Zelensky. Background: Served various roles in the Reagan administration before spending decades in the national security industry. Kupperman joined the NSC in 2018 and served as deputy to national security adviser John Bolton from Jan. to Sept. 2019. He departed shortly after Bolton resigned. Deposition Did not appear Details »

Michael Ellis National Security Council (NSC) deputy legal adviser Involvement: As deputy legal adviser, Ellis may have handled concerns from NSC members including Fiona Hill and Alexander S. Vindman over Ukrainian policy. Background: Michael Ellis has served as special assistant to the president, senior associate counsel to the president, and deputy NSC legal advisor since March 2017. Previously, he worked for the House of Representatives and the White House Office of Strategic Initiatives. Deposition Did not appear Details »