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President Donald Trump speaks at a campaign rally in Sunrise, Fla., Tuesday, Nov. 26, 2019. (AP Photo / Susan Walsh)

The House impeachment report on President Donald Trump will be unveiled Monday behind closed doors for key lawmakers as Democrats push ahead with the inquiry despite the White House’s declaration it will not participate in the first Judiciary Committee hearing.

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In this Feb. 6, 2019 file photo, Supreme Court Chief Justice John Roberts answers questions during an appearance at Belmont University in Nashville, Tennessee. (AP Photo / Mark Humphrey)

While a Senate trial of President Donald Trump now appears inevitable, details of how it will unfold remain unknown. How long will proceedings last? Can either party summon witnesses to make its points? Senators will have to decide these and other, potentially thorny questions.

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President Donald Trump speaks at a campaign rally in Sunrise, Fla., Tuesday, Nov. 26, 2019. (AP Photo / Susan Walsh)

President Donald Trump was briefed on the whistleblower complaint about his dealings with Ukraine before the White House released nearly $400 million in military aid to Kyiv, officials say, shedding new light on events that triggered the impeachment inquiry.

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President Donald Trump speaks before the New York City Veterans Day Parade at Madison Square Park in New York, Monday, Nov. 11, 2019. (AP Photo / Andrew Harnik)

Trump’s promise to release an account of his first conversation with Ukrainian President Volodymyr Zelenskiy comes a day before House impeachment investigators begin public hearings.

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In this July 31, 2019 file photo, National security adviser John Bolton speaks to media at the White House in Washington. (AP Photo / Carolyn Kaster)

The testimony from Christopher Anderson makes clear that administration officials were concerned about Giuliani’s back-channel involvement in Ukraine policy.

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Sen. Lindsey Graham, R-S.C., speaks about a resolution he says he will introduce condemning the Democratic-controlled House for pursuing a “closed door, illegitimate impeachment inquiry,” during a news conference at the Capitol in Washington, Thursday, Oct. 24, 2019. (AP Photo / J. Scott Applewhite)

As the probe hits the one-month mark, Trump and his aides have largely ignored the details of the Ukraine allegations against him. Instead, they’re loudly objecting to the House Democrats’ investigation process.

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House Minority Whip Steve Scalise, R-La., left, speaks at a news conference in front of House Republicans after Deputy Assistant Secretary of Defense Laura Cooper arrived for a closed door meeting to testify as part of the House impeachment inquiry into President Donald Trump, Wednesday, Oct. 23, 2019, on Capitol Hill in Washington. (AP Photo / Patrick Semansky)

Republicans briefly brought the Democrat-led impeachment investigation to a halt when around two dozen GOP House members stormed into a closed-door deposition with a Defense Department official. 

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Ambassador William Taylor is escorted by U.S. Capitol Police as he arrives to testify before House committees as part of the Democrats’ impeachment investigation of President Donald Trump, at the Capitol in Washington, Tuesday, Oct. 22, 2019. (AP Photo / J. Scott Applewhite)

A top U.S. diplomat testified Tuesday that President Donald Trump was holding back military aid for Ukraine unless the country agreed to investigate Democrats and a company linked to Joe Biden’s family.

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President Donald Trump speaks during a Cabinet meeting in the Cabinet Room of the White House, Monday, Oct. 21, 2019, in Washington. (AP Photo / Pablo Martinez Monsivais)

President Donald Trump injected racial overtones into the House impeachment inquiry Tuesday by comparing the Democratic-led investigation into his handling of U.S. policy toward Ukraine to a “lynching.” 

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President Donald Trump gestures while speaking during a Cabinet meeting in the Cabinet Room of the White House, Monday, Oct. 21, 2019, in Washington. (AP Photo / Pablo Martinez Monsivais)

The president, according to people familiar with testimony in the House impeachment investigation, sees the Eastern European ally, not Russia, as responsible for the interference in the 2016 election that was investigated by special counsel Robert Mueller.

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Michael McKinley, a former top aide to Secretary of State Mike Pompeo, right, arrives on Capitol Hill in Washington, Wednesday, Oct. 16, 2019, to testify before congressional lawmakers as part of the House impeachment inquiry into President Donald Trump. (AP Photo / Andrew Harnik)

On Wednesday, a former aide to Secretary of State Mike Pompeo is to speak to the House impeachment panels behind closed doors. Michael McKinley is expected to discuss concerns held by career State Department officials about the treatment of the U.S. ambassador to Ukraine, Marie Yovanovitch.

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Former White House advisor on Russia, Fiona Hill, leaves Capitol Hill in Washington, Monday, Oct. 14, 2019, after testifying before congressional lawmakers as part of the House impeachment inquiry into President Donald Trump. (AP Photo / Manuel Balce Ceneta)

National security adviser John Bolton was so alarmed by Rudy Giuliani's back-channel activities in Ukraine that he described President Donald Trump's personal lawyer as a "hand grenade who is going to blow everybody up," according to a former White House aide.

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Former White House advisor on Russia, Fiona Hill, arrives on Capitol Hill in Washington, Monday, Oct. 14, 2019, as she is scheduled to testify before congressional lawmakers as part of the House impeachment inquiry into President Donald Trump.  (AP Photo / Manuel Balce Ceneta)

Fiona Hill, a former top National Security Council expert on Russia, was testifying to Congress behind closed doors Monday, the latest former Trump administration official to be subpoenaed as part of the House impeachment inquiry into President Donald Trump.

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This combination of photos provided by the Alexandria Sheriff’s Office shows booking photos of Lev Parnas, left, and Igor Fruman. (Alexandria Sheriff's Office via AP)

Two Florida businessmen tied to President Donald Trump’s lawyer and the Ukraine investigation were charged Thursday with federal campaign finance violations. 

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President Donald Trump, joined by from left, Defense Secretary Mark Esper, and Chairman of the Joint Chiefs of Staff Gen. Mark Milley, speaks to media during a briefing with senior military leaders in the Cabinet Room at the White House in Washington, Monday, Oct. 7, 2019. (AP Photo / Carolyn Kaster)

The White House declared Tuesday it will halt any and all cooperation with what it termed the “illegitimate” impeachment probe by House Democrats, sharpening the constitutional clash between President Donald Trump and Congress.

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In this Tuesday, July 10, 2018, file photo, President Donald Trump is joined by Gordon Sondland, the U.S. ambassador to the European Union, second from right, as he arrives at Melsbroek Air Base, in Brussels, Belgium. (AP Photo / Pablo Martinez Monsivais, File)

House Democrats are marching forward with their impeachment inquiry into President Donald Trump, with more depositions coming this week.