With opening statements out of the way, the House Judiciary Committee will turn Thursday to voting on the two articles of impeachment against President Donald Trump.
The first article accuses Trump of withholding USA military aid and a White House meeting from Ukraine in an attempt to pressure that nation to investigate his political rivals. "Will any one of my colleagues on the other side say that it is an abuse of power to condition aid on official acts?" said Democratic Representative Pramila Jayapal.
"This isn't just using the president's power to benefit himself", Tribe said, "but it's doing that in a way that endangers our national security, and that corrupts the electoral process by inviting foreign involvement".
Democrats chided Republicans for their loyalty to Mr Trump.
But it was not yet clear whether Trump was ready to abandon his demand for witnesses, such as Biden, which would trigger demands from Democrats for high-profile Trump administration witnesses.
Much of the impeachment focus has been on a July 25 phone call in which Trump asked Ukrainian President Volodymyr Zelenskiy to investigate Biden and his son Hunter who was on the board of a Ukrainian gas company.
Trump is also accused of obstructing Congress when lawmakers tried to investigate the matter. They said "abuse of power" was a catch-all for Democratic complaints about Mr Trump. 'And it is not before us, and it should not before us because it is not an abuse of presidential power.
"Today's poll is the first time since House Speaker Nancy Pelosi announced the inquiry that more than half of voters say that Trump should not be impeached", Quinnipiac wrote.
McConnell also voiced his displeasure with the House's push to impeach Trump. He said Democrats were misrepresenting his talks with Ukraine and called the proceedings a "phoney hearing".
The final step in the process would be a trial in the Republican-majority Senate, which Majority Leader Mitch McConnell said Wednesday would happen next month."Assuming that House Democrats send us articles of impeachment next week, a Senate trial will have to be our first item of business in January", McConnell said.
Following the House vote, charges will go to the Senate for a trial.
Republicans who hold sway in the chamber appear to favour a quick vote, limiting political fanfare. Rep. Doug Collins, R-Gainesville, is the top Republican on the committee and Reps.
Democrats sought to simplify the public case against Trump by not including other contentious aspects of Mr Trump's tenure, such as his efforts to impede former Special Counsel Robert Mueller's Russian Federation probe.
Republicans disputed the Democrats arguments and said the impeachment drive was a partisan campaign to hurt Trump ahead of 2020.
The Senate which has a Republican majority needs 67 out of 100 votes to convict a president, while the Democrat-controlled House needs a simple majority to pass articles of impeachment.
House Republican leaders are lobbying their members on the House floor to oppose impeachment, House Minority Whip Steve Scalise said in an email to House Republicans, as Republicans work to keep the number of GOP defections on impeachment at zero. According to reports, House Democrats are trying to vote on articles of impeachment before the Christmas break, which starts at the end of next week.
Seeking that change "simply shows the, frankly, absurdity of where we're at", Collins said.
"Wake up!" said Representative David Cicilline, accusing the other party of "wilfully ignoring the facts to protect a corrupt and risky president".