US President Donald Trump speaks during a "Keep America Great" rally at the Monroe Civic Center in Monroe, Louisiana.
The ABC News/Ipsos poll found that 58 percent of Americans are closely following the House Intelligence Committee hearings on the impeachment probe into Trump. Trump has said the impeachment process is stacked against him and is nothing more than a "witch hunt". That would lead to a trial in the Senate on whether to convict Trump and remove him from office.
President Donald Trump has reportedly floated firing administration officials who have testified in the House impeachment investigation into Trump's Ukraine scheme.
During the July 25 phone call Mr Trump also asked Ukrainian President Volodymyr Zelenskiy to look into a discredited theory that Ukraine, not Russian Federation, interfered in the 2016 presidential election. He relayed details from an explosive July 10 meeting at the White House when the ambassador pushed visiting Ukraine officials for the investigations Trump wanted.
Mr Clinton was ultimately impeached in the House but acquited in the Senate.
And he recounted that Mr Sondland told a top Ukrainian official in a meeting that the vital USA military assistance might be freed up if the country's top prosecutor "would go to the mike and announce that he was opening the Burisma investigation". Democrats say Trump demanded that Ukraine investigate his Democratic rivals in return for USA military aid it needed to resist Russian aggression and that may be grounds for removing the 45th president. "You should ask him", Vadym Prystaiko said, according to Reuters. However, 21% said they decided on their position after the public congressional hearings last week. That will change, however, on Wednesday when the USA ambassador to the European Union, Gordon Sondland, takes questions. Morrison will testify alongside Volker, who was also involved in White House meetings.
As an alternative, the aides are reportedly considering having witnesses with temporary posts at the White House, such as Vindman, removed from their posts and returned to their agencies.
Mr Trump has said he had no recollection of the overheard call and has suggested he barely knew Mr Sondland, a wealthy donor to his 2016 campaign.
Besides Sondland, the committee will hear on Wednesday from Laura Cooper, a deputy assistant secretary of defence, and David Hale, a State Department official.
If Trump wants to contest testimony by Sondland or any other witness about his words or actions, he should be willing to answer questions under oath from the House investigators.
Former top national security adviser to President Donald Trump, Tim Morrison, arrives for a closed door meeting to testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington on October 31, 2019.