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.
Rep. Jim McGovern, D-Mass., opened up floor debate on the resolution to solidify the procedures for the impeachment inquiry.
McGovern, the House Rules Committee chairman, introduced the resolution Thursday morning. Stressing "no one is above the law," McGovern said there is "serious evidence Trump might have violated the Constitution" with regard to his conduct toward Ukraine.
The resolution, he said, was about "transparency" and outlining "due process for the president."
He added that "some on the other side" would never be satisfied with the process, no matter what evidence was outlined.
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114d ago / 1:33 PM UTC
Trump tweets: 'READ THE TRANSCRIPT'
As the House impeachment vote begins, Trump weighs in, urging followers to read the White House summary of his call with the Ukrainian president that is at the center of the impeachment inquiry.
The House began debating at approximately 9:25 a.m. on the impeachment resolution with Speaker Nancy Pelosi presiding in the chair. Debate is expected to last approximately an hour with the time being equally divided back and forth between Republicans and Democrats
Debate on the procedures — which include beginning public hearings and the release of some of the information gathered in the ongoing inquiry over the last few weeks — is expected to begin around 9 a.m. ET.
All House Republicans are expected to oppose the resolution, as may a handful of Democrats who are not on board with the impeachment inquiry.
Democrats have set aside one hour for debate on the resolution — 30 minutes for Democrats, 30 minutes for Republicans. The vote on the resolution is slated to begin between 10:30 a.m. and 11 a.m. ET., after House Speaker Nancy Pelosi delivers her weekly on-camera press conference around 10:15 a.m. ET. If it goes according to schedule, the vote could be completed before noon, but if the GOP minority makes use of parliamentary delaying tactics, the process could take a lot longer.
A few things to watch for tomorrow that could delay the vote timing slightly:
During the debate time, if Speaker Pelosi, House Majority Leader Steny Hoyer or House Minority Leader Kevin McCarthy speak, they are allowed "magic minutes" which basically means their speeches don’t take away time from the hour debate. In that case, the hour-long debate could be extended slightly.
Republicans, unhappy about taking this vote, could try to ask for some procedural votes during the debate period. If, for example, Republicans ask to adjourn, the House will have to stop debate, have all members come to the chamber and vote. After that call to adjourn fails (because Democrats are in control), the debate will pick back up again with whatever time was left.
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114d ago / 11:53 AM UTC
Everything you need to know about impeachment
What is impeachment and how does it work? 10 facts to know.
Must the Senate hold a trial? How does Trump differ from Clinton? Can the president pardon himself? And much more.
Read the story from NBC's Pete Williams, Frank Thorp V and Alex Moe here.
By 52 to 44 percent, voters in Arizona, Florida, Michigan, North Carolina, Pennsylvania and Wisconsin opposed impeaching and removing Trump. By that same 52 to 44 percent, voters in those states supported the inquiry.
The battleground poll was conducted from Oct. 13 to Oct. 26 and surveyed 3,766 registered voters across the six states. The margin of error was plus-or-minus 1.7 percentage points.
Also, Timothy Morrison, the National Security Council's senior director for Europe and Russia, is due to be deposed in closed session. There are no plans for an opening statement. Morrison replaced Fiona Hill, who has testified that Donald Trump's personal lawyer, Rudy Giuliani, oversaw a "shadow foreign policy" on Ukraine for the president's personal political gain while shutting out NSC staff and career diplomats.
At 4 p.m., Judge Richard Leon, a senior judge at the U.S. District court for the District of Columbia, hears a case filed on behalf of former deputy national security adviser Charles Kupperman, who asked a federal court to decide whether he would need to testify. The White House has tried to block his appearance, and Kupperman, who worked under national security adviser John Bolton, filed a lawsuit Friday asking a federal judge to rule on whether he must testify under a congressional subpoena.
White House says it is 'false' that Vindman suggested filling in omissions
White House Press Secretary Stephanie Grisham disputed claims that Lt. Col. Alexander Vindman tried to edit a White House log of a July call between President Donald Trump and Ukrainian President Volodymyr Zelenskiy to include details that were omitted.
"President Trump released a full and accurate transcript of his call with President Zelenskiy so the American people could see he acted completely appropriately and did nothing wrong.
The media is reporting that Lt. Col. Alexander Vindman claims he proposed filling in words that were missing in areas where ellipses were shown in the transcript — this is false.
Because Chairman Schiff has kept his sham hearings secret and has excluded the President’s counsel from the room, we cannot confirm whether or not Lt. Col. Vindman himself made any such false claim. What we can confirm is that he never suggested filling in any words at any points where ellipses appear in the transcript."