The Senate voted in early February to acquit the president on both charges.
Trump's impeachment followed weeks of testimony related to his efforts to press Ukraine for investigations into Democratic rivals and hours of fiery debate over the process.
Trump is only the third president in U.S. history to be impeached. Read all of the breaking news and analysis on impeachment from NBC News' political reporters, as well as our teams on Capitol Hill and at the White House.
Deputy national security adviser's testimony to bring inquiry within Bolton's orbit
As NBC News has reported, House investigators would like to interview former national security adviser John Bolton as part of their impeachment inquiry. Next week’s scheduled interview with former deputy national security adviser Charles Kupperman, brings the inquiry closer into Bolton’s orbit.
Multiple lawmakers tell NBC News that House investigators thought it necessary to interview Morrison after top diplomat to Ukraine Bill Taylor referenced him multiple times during his closed-door session last week.
Here's the updated depositions schedule:
Due to services honoring the late Rep. Elijah Cummings, D-Md., no depositions will be held Friday.
Philip Reeker, acting assistant secretary of state for European and Eurasian Affairs, is expected to give a private deposition on Saturday.
Kupperman is expected to appear in closed session Monday.
Lt. Col. Alexander Vindman, director for European affairs at the National Security Council, is expected to appear Tuesday.
Kathryn Wheelbarger, acting assistant secretary of defense for international security affairs, is expected to appear Wednesday.
Morrison is expected to appear Thursday.
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Stephanie Perry, John Lapinski and Charles Riemann
124d ago / 3:06 PM UTC
New poll: Americans split down party lines on impeachment
Americans are evenly divided on whether President Donald Trump should be impeached. Forty-nine percent think he should be impeached and removed from office and 49 percent are against it, according to results from a new NBC News|SurveyMonkey poll.
Voters are sharply divided along party lines. Nine in 10 Republicans and Republican-leaning independents are against impeachment and 89 percent of Democrats and Democratic-leaners are in favor of impeachment. Independents who don’t lean toward either party are more split with a 53 percent majority saying Trump should be impeached and 44 percent saying he should not.
John Bolton's lawyers have been in contact with House committees leading inquiry
Former national security adviser John Bolton's lawyers have been in contact with officials on the committees leading the impeachment inquiry, a person close to Bolton has confirmed to NBC News.
Investigators in the inquiry have negotiated with a Bolton lawyer about a date for a closed-door deposition, The New York Times reported Thursday, citing two people briefed on the matter.
Bolton wanted no part of the President Donald Trump's alleged attempts to pressure the president of Ukraine to investigate what has been described as a conspiracy theory about interference in the 2016 election, as well as into former vice president Joe Biden and his son, Hunter, NBC News has reported.
Bolton told top White House official Fiona Hill to report the situation to the top lawyer at the National Security Council, John Eisenberg, according to the person in the room for Hill’s closed-door testimony last week.
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124d ago / 4:09 PM UTC
Thursday's biggest impeachment-related news
If you're just catching up on the news, here are some of the biggest impeachment-related stories on Thursday you may have missed:
Sen. Lindsey Graham introduced a resolution backed by more than 40 GOP senators excoriating House Democrats' impeachment inquiry, accusing Democrats of violating due process for interviewing key witnesses behind closed doors.
The review is being conducted by Connecticut U.S. Attorney John Durham. The New York Times first reported Thursday that the administrative review has turned into a criminal investigation. It’s not clear when the change occurred, but the probe began in May as an administrative review.
The Times reported that the change in status gives Durham the power to subpoena witness testimony and documents, to impanel a grand jury and to file criminal charges.
Leigh Ann Caldwell, Andrea Mitchell, Heidi Przybyla and Alex Moe
125d ago / 11:02 PM UTC
The moment that shocked the room during Taylor's Ukraine testimony
WASHINGTON — One stunning moment during a top diplomat's testimony this week may prove pivotal to the congressional impeachment inquiry and even led to gasps in the room, according to one source who was present.
It occurred when William Taylor, the lead U.S. envoy to Ukraine, described a video conference call in July with officials from the White House Office of Management and Budget. Even Republicans who were present expressed concern, the source said, because the call made a direct link between President Donald Trump and the withholding of military aid to Ukraine for political purposes.
Sen. Mazie Hirono, D-Hawaii, a member of the Senate Armed Services and Judiciary committees, told MSNBC on Thursday that Democrats could be looking at a November time frame for making the impeachment proceedings public.
Hirono added that it's "appropriate" that the inquiry should continue in the manner that it has, after criticizing GOP efforts to disrupt the deposition of a top Pentagon official overseeing Russia, Ukraine and Eurasia policy.
Rebecca Shabad, Shannon Pettypiece and Frank Thorp V
125d ago / 12:02 AM UTC
Graham unveils measure slamming impeachment inquiry as Trump praises GOP efforts to fight back
WASHINGTON — Sen. Lindsey Graham, R-S.C., on Thursday introduced a resolution backed by more than 40 GOP senators excoriating House Democrats' impeachment inquiry, accusing Democrats of violating due process for interviewing key witnesses behind closed doors.
Graham, chairman of the Senate Judiciary Committee, introduced the five-page resolution that includes Senate Majority Leader Mitch McConnell, R-Ky., as a co-sponsor on Thursday afternoon.
"What you're doing today, in my view, is unfair to the president is dangerous to the presidency," Graham said at a press conference detailing the resolution to reporters, adding "there's a way to do it — a right way and a wrong way — and you've chosen the wrong way."
The measure calls on the House to hold a floor vote that would formally initiate the impeachment inquiry, provide Trump with "with due process, to include the ability to confront his accusers, call witnesses on his behalf, and have a basic understanding of the accusations against him that would form any basis for impeachment," according to a summary released by his office.
What House rules say about Republicans' complaints about access
Several Republicans who Rep. Matt Gaetz, R-Fla., said planned to storm a secure deposition room Wednesday to complain about access were already able to attend the witness' testimony, according to House rules.
Those rules say members may participate in the depositions if they serve on the committees involved, stating, “Only members, committee staff designated by the chair or ranking minority member, an official reporter, the witness, and the witness's counsel are permitted to attend.”
That means Democrats and Republicans on the House Intelligence, Oversight and Foreign Affairs committees have been allowed to take part in the impeachment inquiry depositions, which on Wednesday involved testimony from a top Pentagon official overseeing Ukraine policy.
At least nine Republicans that already have access to the depositions were on Gaetz's list of those planning to attend his protest at the Sensitive Compartmented Information Facility, or SCIF — a sit-in that delayed the testimony of Laura Cooper, the deputy assistant secretary of defense for Russia, Ukraine and Eurasia, for several hours. They include Reps. Jim Jordan of Ohio, the ranking member of the House Oversight Committee, Lee Zeldin of New York, Paul Gosar of Arizona, Steve Watkins of Kansas, Ralph Norman of South Carolina, Mark Green of Tennessee, Jody Hice of Georgia, Ron Wright of Texas and Scott Perry of Pennsylvania.
Several of those members — Jordan, Zeldin, Gosar, Watkins, Norman, Hice and Perry — have been spotted by NBC News going in and out of the depositions. In total, 47 Republicans, or about a quarter of the conference in the House, are already able to attend the closed-door tesimony.