Speaker Nancy Pelosi Nancy PelosiPelosi: Trump Supreme Court pick 'threatens' Affordable Care Act Sunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election Will Democrats attempt to pack the Supreme Court again? MORE (D-Calif.) on Wednesday kick-started the hours-long impeachment debate with a speech stating that the House must move to impeach President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE in order to protect the republic.

Pelosi described the role of the House as being the "custodians of the Constitution," saying that Trump put his own interests ahead of those of the nation when he invited a foreign nation to interfere in an upcoming presidential election in a way that would benefit him politically.

"Our founders' vision is under threat from actions at the White House," Pelosi said on the House floor, wearing all black as she faced her colleagues on both sides of the aisle. "That is why today as Speaker of the House, I sadly and solemnly open the debate on the impeachment of the president of the United States."

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Pelosi began her floor speech by asking House members to recall the meaning of the Pledge of Allegiance to the U.S. flag, emphasizing that the debate over two articles of impeachment charging Trump with high crimes and misdemeanors will center around the line in the pledge: "The Republic for which it stands."

And she concluded her remarks by praising the legacy of the late House Oversight and Reform Committee Chairman Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.), who died earlier this year, as well as praising other members for showing courage with their vote to impeach Trump.

"Today we are here to defend the democracy for the people," she concluded.

As the Speaker walked off the House floor, Democrats rose in a standing ovation.

Democrats argue that Trump dangled the promise of a White House meeting and nearly $400 million in critical U.S. aid as leverage to press Ukrainian President Volodymyr Zelensky to open an investigation into former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE and unfounded claims that Ukraine also interfered in the 2016 election.

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Republicans, on the other hand, have described the impeachment as a "sham" and "hoax" designed by Democrats to boot Trump from office because they cannot beat him at the ballot box.

Democrats and Republicans are expected to spend roughly six hours on the House floor debating the propriety of Trump's contacts with Ukraine, before the final votes on the articles of impeachment are taken up by the lower chamber.

The two impeachment articles — abuse of power and obstruction of Congress — are expected to pass largely along party lines, making Trump the third president in the nation's history to be impeached and the first to run for reelection after such a vote takes place.