All three witnesses have testified behind doors in recent weeks, but the hearings on Wednesday will be the first time Americans hear directly from them.
- At 14:30 ET, the committee is scheduled to begin its hearing with Cooper and Hale, though it depends on whether the first hearing ends punctually.
How can I view CNN's coverage?
Hearings will be aired on CNN, CNN International and CNN en Español with instant analysis and broadcast live on CNN.com's desktop and mobile homepages and on mobile devices via CNN's iOS and Android apps.
] What are the timing and format of the hearings?
Chairman of the Committee, Democratic MP Adam Schiff of California, and Rep. Devin Nunes of California, Supreme Republican, will launch the hearings with opening statements.
The witnesses are then sworn in and can make their own opening declarations.
Additional survey rounds are possible. Each legislator on the committee will have five minutes to ask the witness questions.
Who is Gordon Sondland?
Sondland, the US Ambassador to the European Union, was at the center of the House of Representatives' investigation of President Donald Trump and Ukraine over his involvement in a "shadow" policy campaign in Ukraine at the behest of the President.
One day after Trump's call with Ukrainian President Volodymyr Zelensky on July 25 and a meeting in Warsaw (Poland) on September 1
Who is Laura Cooper?
Cooper was the sole witness of the Pentagon, who testified in the impeachment of the House democrats in Trump and Ukraine.
Cooper had told her in a meeting that he wanted to try to lift the aid by making a public statement to the Ukrainians that they were initiating the investigation they were seeking would trump.
Who is David Hale?
During the Clinton administration, he was assistant to the executive of then Foreign Minister Madeleine Albright.
He was US Ambassador to Jorda n in 2005 Ambassador to Lebanon from 2013 to 2015 and Ambassador to Pakistan from 2015 to 2018.
CNN's Chandelis Duster, Devan Cole, Jeremy Diamond and Kaitlan Collins contributed to the report.