Former national security adviser John Bolton, who was sacked by Trump in September, was called to appear on Thursday but failed to do so. Bolton's attorney said he would not appear voluntarily and he has not yet been subpoenaed. Cooper had previously said Bolton wouldn't appear without one.
A House intelligence committee official said the panel has no interest in engaging in a drawn-out court fight over a subpoena for Bolton and will simply add the White House's instructions against testifying as evidence of the president's obstruction of Congress. The person wasn't authorized to discuss the situation publicly and was granted anonymity.
According to the Post report, Barr denied the request for the news conference, which came sometime around September 25, when the White House released a memo summarizing the president's July 25 phone call with Ukrainian President Volodymyr Zelensky.More news: 'Knight Before Christmas': Vanessa Hudgens falls for time traveler in first trailer
The public impeachment hearings for U.S. President Doanld Trump will start on November 13 and will include testimony from witnesses who previously gave their account of what happened on the a phone call with Ukraine.
His three-page update, tucked beneath hundreds of pages of sworn testimony from Sondland and former Ukraine Special Envoy Kurt Volker, was released by House investigators as Democrats prepared to push the closed-door sessions to public hearings as soon as next week.
Representative Adam Schiff, the Democratic chairman of the Intelligence Committee, said on Wednesday his committee would hold the first public sessions next week.
Kent, who heads the European and Eurasian bureau at the State Department, expressed concerns about White House efforts to remove the then-ambassador to Ukraine, Marie Yovanovitch. Perry did not show up for his Wednesday interview and Mulvaney was not expected to appear for his scheduled deposition on Friday.More news: Bill Gates Criticizes Warren's Wealth Tax Plan
Yovanovitch herself told investigators she was ousted because Trump's personal lawyer Rudy Giuliani and others wanted her out of the way as they conducted Ukraine policy outside traditional diplomatic channels.
They are trying to determine whether Trump froze $391 million United States in security assistance for Ukraine to put pressure on Zelensky to conduct the investigation, misusing USA foreign policy for his personal gain. Lawmakers will look to Williams for information about how much Pence knew about efforts by Trump and those around him to pressure Ukrainian officials to investigate former Vice President Joe Biden and his son Hunter, and foreign interference in the 2016 USA election.
Though Trump has said there was no "quid pro quo", several of the witnesses, including Taylor, have testified that it was their understanding that Ukraine would not receive military assistance or a coveted Oval Office visit until it met the president's demands.
Democrats say the refusal of witnesses like Bolton, Mulvaney and Perry to appear - under Trump's orders - will add fuel to their case that the president has obstructed justice.More news: Hakimi brace seals stunning Dortmund win over Inter
Williams is Pence's special adviser on Europe and Russian Federation, and could offer important insights into the vice president's interactions with Ukrainian leaders and any contact that he might have had with Rudolph W. Giuliani, the president's personal lawyer.