The trio of witnesses called to testify next week in the first public impeachment hearings are some of the biggest names and most significant players in the Democrats' sprawling six-week probe into allegations President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE pressured a foreign power to investigate his political rivals.

House Democrats know that millions of Americans will be tuning in to watch the impeachment inquiry for the first time now that weeks of closed-door depositions are giving way to televised Watergate-style hearings that are set for next Wednesday and Friday.

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The hearings could be held in one of the Capitol complex's larger rooms, such as the cavernous Ways and Means hearing room.

House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (Calif.) and fellow Democrats have chosen three current and former State Department officials to go before the cameras first because they view them as credible, nonpartisan witnesses who will be able to walk the public through exactly how Trump and his allies engaged in wrongdoing in their dealings with Ukraine.

The three witnesses — William Taylor, the top diplomat in Ukraine; George Kent, the deputy assistant secretary of State for European and Eurasian Affairs; and Marie Yovanovitch, the former ambassador to Ukraine — are all veteran career foreign service officials who have served in both Democratic and Republican administrations.

“You will see throughout the course of the testimony ... the most important facts are largely not contested,” Schiff told reporters Wednesday as he announced the first public hearings of the impeachment inquiry.

“We are getting an increasing appreciation for just what took place during the course of the last year and the degree to which the president enlisted whole departments of government in the illicit aim of trying to get the Ukraine to dig up dirt on a political opponent as well as further a conspiracy theory about the 2016 election that he thought would be beneficial to his campaign,” Schiff added.

Taylor and Kent will testify before the Intelligence Committee in a public hearing on Wednesday. Yovanovitch, the ousted U.S. ambassador to Ukraine, will testify two days later.

“You want to have as big of a blockbuster coming out of the gate as possible,” said a senior Democratic aide close to the impeachment probe. “The benefit of these guys is they can tell the totality of events; they can tell the whole story.”

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Congressional investigators are expected to wrap up the last of their private depositions by the end of this week, Schiff said. But more closed-door testimony could occur if key witnesses such as former national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE, Energy Secretary Rick Perry Rick PerryEnergy secretary questions consensus that humans cause climate change OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project MORE or acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE reverse course and agree to testify in private.

Taylor, the chargé d’affaires for Ukraine, will be up first — and that’s not by coincidence. Early in the probe, text messages between Taylor and other diplomats showed that he sounded the alarm about a possible quid pro quo, warning it was “crazy” for Trump to withhold nearly $400 million in security aid until Ukraine agreed to launch investigations that would be politically beneficial to Trump.

Last month, Taylor testified that he was extremely concerned about the “highly irregular” shadow foreign policy campaign — led by the president’s personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE and other Trump allies — demanding that Kiev investigate the Bidens and the 2016 election before receiving the military aid and a one-on-one meeting with Trump.

On Wednesday, Democrats released the 324-page transcript of Taylor’s private deposition, which showed that he stated it was his “clear understanding” there had been a quid pro quo.

The televised hearings, Schiff said, will be an opportunity for the public to hear from witnesses firsthand and evaluate their credibility. He described Taylor as a “dedicated public servant.”

“Ambassador Taylor is somebody who graduated from West Point, somebody who served in Vietnam,” Schiff said, “someone who is performing another vital service to the country in relating the facts, the very disturbing facts, that came to his attention.”

Kent, a State Department official since 1992, also testified about the pressure campaign on Ukraine, telling House investigators that he had raised concerns about Giuliani’s contacts with the country as early as March, prompting a supervisor to tell him to lay low. Kent also provided details about the efforts of Trump allies to oust Yovanovitch as ambassador to Ukraine.

Yovanovitch personally experienced those events. She was recalled from Kiev in May after Giuliani and other Trump allies mounted what Democrats have labeled a “smear campaign” against her. Democrats say Trump, Giuliani and others saw Yovanovitch as a major obstacle to the political Ukraine investigations.

“We are bringing forward the people who were direct witnesses and actors in the president’s Ukraine shakedown,” Rep. Jamie Raskin Jamin (Jamie) Ben RaskinOVERNIGHT ENERGY: House passes sweeping clean energy bill | Pebble Mine CEO resigns over secretly recorded comments about government officials | Corporations roll out climate goals amid growing pressure to deliver On The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security House panel pulls Powell into partisan battles over pandemic MORE (D-Md.), a member of the House Oversight and Reform Committee who has been attending the closed-door hearings, told The Hill on Wednesday. “Ambassador Yovanovitch was a victim of the scheme to extract political favors from the Ukrainian government for the president’s campaign reelection purposes. To me, she is a perfectly logical place to start, and she is a great witness to begin telling the story to America.”

“People will be able to see for themselves what this Ukraine shakedown meant in the lives and work of dedicated public servants,” he added.

Trump for weeks has denied any quid pro quo with Ukraine and has called the Democrats’ impeachment inquiry a “witch hunt” and “sham.”

The duration of the public hearings depends in large part on how many other witnesses Democrats call.

Lt. Col. Alexander Vindman, a National Security Council official, is expected to testify given that he already privately told investigators that he twice raised red flags with his superiors after listening in on the July 25 phone call between Trump and Ukrainian President Volodymyr Zelensky.

Republicans on the Intelligence panel will try to call their own witness list, but under the impeachment resolution passed by the House last week, Democrats will be able to veto any witness requested by the minority.

By holding public hearings during the two weeks before the Thanksgiving recess, Democrats could be in a position to bring articles of impeachment to the House floor by December.