The public impeachment hearing involving President Donald Trump will begin Wednesday morning. The inquiry will include three public hearings from three State Department officials.
On Wednesday the public will hear from Bill Taylor, a top U.S. diplomat in Ukraine, and George Kent, a high-level department official.
On Friday, the committee will hear from Marie Yovanovitch, a former ambassador to Ukraine.
Republicans are poised to defend the president amid this probe from the House Democrats.
The hearing comes after House Speaker Nancy Pelosi launched the official and formal impeachment inquiry against President Trump -- a probe to find out whether the president abused his presidential powers. In an Associated Press story, she said such actions would mark a "betrayal of his oath of office" and declared: "No one is above the law."
House Intelligence Committee Chairman Adam Schiff is leading the impeachment investigation.
All three of the officials have already testified behind closed doors, according to an Associated Press story. "The Constitution doesn't require a vote to begin impeachment."
The hearings come after President Trump asked the new Ukranian President to investigate former Vice President Joe Biden and his son, Hunter Biden, in a July phone call and also asked the new leader to investigate any role Ukraine may have played in the 2016 presidential election.
Meanwhile, Trump has called the probe "illegitimate," a "witch hunt" and called his phone call with the Ukranian president "perfect."
In September, he released the transcript of the July phone call, which was the second phone call between the two leaders. This week, he tweeted he would release a transcript of his first call with Ukrainian President Volodymyr Zelensky.
Congress and the White House have been in a standoff in recent weeks after numerous top White House officials have refused the summons of a House subpoena including Charles Kupperman, a deputy to former national security adviser John Bolton, according to an AP story.