Ms. Hill is a widely respected, British-born former Brookings Institution scholar and intelligence officer. She is the author, with Clifford Gaddy, of “Mr. Putin,” a critical biography of the Russian leader, and she was appointed senior director for Russian and Eurasian affairs on the National Security Council staff in 2017. She turned over her duties to her successor on July 15 and left on July 19, just days before the July 25 call.
For much of her tenure, Ms. Hill found herself caught in the middle, a noted skeptic of Mr. Putin working for a president who valued his friendship with the Russian leader. She came under fire from some of the most conservative figures and news media outlets around Mr. Trump, which portrayed her as an enemy within, even as some of her longtime friends and colleagues expressed disapproval that she had gone to work for the president in the first place.
One of the most dramatic moments she described came in the July 10 meeting in Mr. Bolton’s office that included Mr. Sondland; Kurt D. Volker, then the special envoy for Ukraine; Rick Perry, the energy secretary; and two Ukrainian officials.
The purpose of the meeting was to talk about technical assistance to Ukraine’s national security council. The Ukrainians were eager to set up a meeting between Mr. Trump and Mr. Zelensky, who was elected on a promise to clean up corruption and resolve the country’s five-year war with Russian-armed separatists.
Mr. Bolton was trying to not commit to a meeting, according to Ms. Hill’s testimony. Mr. Sondland got agitated, Ms. Hill testified, and let out that there was an agreement with Mr. Mulvaney that there would be a meeting if Ukraine opened up the investigations the White House was seeking.
Mr. Bolton immediately ended the meeting abruptly. As the group moved toward the door, Mr. Sondland said he wanted them to come down to the ward room next to the White House mess to discuss next steps. Mr. Bolton pulled Ms. Hill aside to instruct her to go to the ward room and report to him what they talked about.
When she got downstairs, Mr. Sondland was talking with the Ukrainians and specifically mentioned Burisma, the Ukrainian energy firm that had Hunter Biden, the former vice president’s son, on its board.