President Trump; House Speaker Nancy Pelosi.
The House intelligence committee is preparing for a second week of public hearings as part of its inquiry, including with the man who is arguably the most important witness.
Pushing back against accusations from the Republican President that the process has been stacked against him, Ms Pelosi said Mr Trump is welcome to appear or answer questions in writing, if he chooses. Trump tweeted Monday morning.
So far investigators have heard testimony that builds a powerful, if not yet conclusive, case that there was a corrupt connection between a delay of military aid for Ukraine and Trump's desire for investigations by Ukraine that would benefit him politically, including a probe of former Vice President Joe Biden.
The majority of Americans (67%) said they took a position on whether Trump should be impeached in September, when the news of his July phone call with Ukrainian President Volodymyr Zelenskyy went public.
"Two State Department officials - Deputy Assistant Secretary of State George Kent and acting ambassador to Ukraine William B. Taylor Jr. - on Wednesday will be the first witnesses to testify publicly".
A government whistleblower's complaint about that call led House Democrats to launch the impeachment inquiry.
USA ‘flexible’ on military exercises with South Korea as North demands cancellation
At a high-level defense policy meeting between the United States and South Korea held in Seoul on November 16, U.S. Esper was in Bangkok after meeting with South Korean officials during a two-day trip to Seoul .
In that conversation, Trump asked Sondland if the Ukrainians were going to "do the investigation", and Sondland responded, "He's gonna do it". Democrats say Trump demanded that Ukraine investigate his Democratic rivals in return for US military aid it needed to resist Russian aggression and that may be grounds for removing the 45th president.
"He was talking about the 2016 elections and an investigation into the Bidens and Burisma", Vindman testified, referring to the gas company in Ukraine; Hunter Biden served on its board.
Johnson says he was concerned at the time and spoke with Trump a few days later to "try to persuade him to authorize me to tell Zelensky that the hole would be lifted on military aid".
"He made a mistake, and he knows her strength", Pelosi said. He should come to the committee and testify under oath. Morrison will testify alongside Volker, who was also involved in White House meetings.
Trump also submitted written responses in the investigation by special counsel Robert Mueller, who later testified that the president's sworn testimony was "generally" untruthful.
He said the White House's insistence on blocking witnesses from cooperating begs the question: "What is he hiding?"
Hale, the undersecretary of state for political affairs, was the highest ranking State Department official to testify in the House's closed-door impeachment inquiry depositions when he appeared earlier this month. On Thursday, Fiona Hill, a former top NSC staff member for Europe and Russian Federation, will appear.