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.
White House working 'nonstop' to shore up GOP support in face of vote
The White House this morning is keyed in on the significant vote happening on the House floor — and aides believe four or five Democrats could cross party lines to vote with Republicans, according to an administration source.
Another White House aide says the administration has been working “nonstop” to shore up Republican support since House Speaker Nancy Pelosi announced the vote: President Trump has met with more than 60 House Republicans face to face over the last two weeks and made numerous phone calls to Republicans, we’re told.
It was also the president who directed acting chief of staff Mick Mulvaney to meet with 30 Republican members at Camp David almost two weeks ago.
Pelosi defends resolution's rules, responding to GOP complaints they're not fair to Trump
Speaker Nancy Pelosi, D-Calif., defended the rules in the impeachment resolution Thursday ahead of the floor vote on the measure, responding to GOP complaints that they're not fair to President Donald Trump and Republicans.
“These rules are fairer than anything that has gone before in terms of an impeachment proceeding,” Pelosi told reporters at her weekly press conference.
Pelosi spoke to reporters before the floor vote, which she is expected to preside over — a rare move for the House speaker.
Pelosi declined to answer any additional questions “about what the Republicans say” regarding the resolution. She began her comments by stating that "no one" comes to Congress planning to impeach a president.
But she blasted Trump for acting as if he can do whatever he wants, ignoring the Constitution.
“We will proceed with the facts, the truth,” she said about the impeachment inquiry. “This is a sad day.”
Rep. Norma Torres, D-Calif., appeared next to a graphic of Trump that refers to his July call with Ukrainian President Volodymyr Zelenskiy in which he asked Volodymyr for a "favor." That call is at the center of Democrats' impeachment efforts.
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117d ago / 2:38 PM UTC
Nadler slams Trump, saying his actions 'represent a profound offense against the Constitution'
House Judiciary Chairman Jerrold Nadler, D-N.Y., whose committee would oversee the creation of articles of impeachment, used his time to condemn the president and lay out the allegations being made against him.
It is “indefensible for any official to demand that an ally investigate his or her political adversaries,” Nadler said — a reference to the July 25 phone call between Trump and Ukrainian President Volodymyr Zelenskiy.
If the allegations against Trump are found to be true, he said, it “would represent a profound offense against the Constitution and the people of this country.”
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117d ago / 3:19 PM UTC
Steve Scalise criticizes inquiry as 'Soviet-Style impeachment'
Rep. Steve Scalise, R-La., delivered a fierce criticism of the impeachment proceeding as he stood next to a graphic featuring an image of Moscow's Red Square and a hammer and sickle in an attempt to demonize Democrats' efforts as "Soviet-style."
Speaker Pelosi is planning to preside over the House during the vote on the impeachment resolution, a senior Democratic leadership source tells NBC News. This is unusual for the speaker and shows the gravity of today’s vote. It will be worth watching if Pelosi votes today; typically, the speaker does not.
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117d ago / 2:31 PM UTC
New York Rep. Joseph Morelle: 'Our only goal is uncovering the truth'
Rep. Joseph Morelle, D-N.Y., a member of the House Rules Committee, defended the inquiry in plain language.
"Our only goal is uncovering the truth," he said.
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117d ago / 2:57 PM UTC
Rebutting Pelosi, McCaul says Constitution doesn't say 'you can do whatever you want to do'
Rep. Michael McCaul, R-Texas, a member of the House Foreign Affairs Committee, offered the first Republican rebuttal to House Speaker Nancy Pelosi, D-Calif., arguing that “Article One” of the Constitution does not say “you can do whatever you want to do.”
He said that the process of the impeachment inquiry “denies basic fairness” to Republicans and to the American people and slammed House Intelligence Committee Chairman Adam Schiff, D-Calif., for having conducted a “secret probe outside his committee’s jurisdiction.”
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116d ago / 1:54 PM UTC
Pelosi holds press conference before impeachment resolution vote