"Taken together, these two articles charge President Trump, with placing his private, political interests above our national security, and above our free and fair elections, and above our ability to hold public officials accountable," Nadler said.
He ticked through the articles, and defended Democrats' timetable.
"Some ask, why not take more time?" Nadler asked.
"One indisputable truth has emerged," he continued. "If we do not respond to President Trump's abuses of power, they will continue."
He also delivered a message to Republicans:
"I know you. I have worked with many of you for years. I consider you to be good and decent public servants. I know this moment may be difficult, but you still have a choice," he said.
"One way or the other, President Trump will not be president forever," he added. "His time has passed, his grip on our politics is gone when our country returns as truly it will -- stronger ties, stronger leadership -- history will look back on our actions here today. How would you be remembered?"
Ranking Member of the House Judiciary Committee Rep. Doug Collins, R-Ga., responded with a passionate and fiery opening statement repeating many of his past criticisms, before ticking through examples of what he called "the big lie" by the Democrats.
"What's the big lie? It’s the one Democrats have told the American people for the last three years," Collins said, defending Trump. "The big lie is that the ends justify the means. The big lie is that a sham impeachment is OK because the threat is so great. The big lie is that political expedience is honorable and justifiable. History has shown that to be untrue and dangerous."
Rep. Louie Gohmert, R-Texas, ticked through a list of fact-witnesses Republicans have requested to hear from, including the individual some Republicans have publicly alleged is the whistleblower who called attention to Trump's discussion with Ukrainian President Volodymyr Zelenskiy. He also went as far as to call this "a sad day for America."
Another Democrat, Rep. Cedric Richmond, resurrected a famous 2016 line from the president that he could "stand in the middle of Fifth Avenue and shoot somebody and I wouldn't lose voters" to say that the president is "shooting holes in our Constitution."
Richmond looked across the dais at the Republicans and asked: "If the tables were turned, do you think he would stand with you?"
Democrats generally defended the pace of their proceedings, warning that Trump continued to obstruct Congress and encouraged interference in the upcoming election.
Their urgency, some Democrats argued, was justified by his lawyer Rudy Giuliani's most recent trip to Ukraine last week.
"I did not call for impeachment before but I called for impeachment today, because this is one heck of an emergency," Rep. Hank Johnson, D-Ga., said. "The facts are clear. President Trump undermined America's foreign policy to pursue what his own national security staff called it domestic political errand."
Republicans largely hewed to criticizing Democrats' impeachment proceedings, slamming the articles they have drawn up against the president and accusing them of waging a politically motivated campaign against Trump that began when he took office.
Rep. Matt Gaetz, R-Fla., referred to the Democrats as "sore losers."
"President Trump's true crime in their eyes was win in 2016 election, against all odds and against the establishment of both parties," Gaetz said.
In one of the most emotional moments of the evening on the Democratic side, freshman Rep. Lucy McBath, D-Ga., who ran for Congress as a gun control advocate after the shooting of her 17-year-old son in 2012, promised to "vote my conscience" and do so "with a heavy heart and a grieving soul."
McBath, unlike most of the Democrats on the committee, is from a deep red district -- and voting for impeachment could have ramifications for her in 2020.
"I believe the president abused the power of his office, in putting his own interests above the needs of our nation," she said.
"This is not why I came to Washington," she said. "I came to Washington full of hope empowered by my community to serve in Congress."
Nadler also acknowledged the absence Rep. Ted Lieu, D-Calif., who underwent a heart procedure at George Washington University Hospital and will miss the week's hearings. but said he would be watching "a lot of TV."
Each lawmaker on the 41-member committee will have the opportunity to make a five-minute opening statement before the committee reconvenes Thursday morning to continue debate and to make any changes to the wording.
It's unlikely that Democrats will approve any substantive changes to the articles before the expected party-line vote to send them to the full House Thursday ahead of final votes next week, setting the stage for a Senate trial beginning in January.
Nadler announced Tuesday that Democrats were going forward with charges of abuse of power and obstruction of Congress.
Nadler, flanked by House Speaker Nancy Pelosi and House Intelligence Chairman Adam Schiff, said Trump had "violated his oath to the American people."
Schiff, whose committee led the impeachment probe with regard to Ukraine matters, said the evidence of Trump's misconduct is "overwhelming and uncontested" and said he left them no choice but to act.
"The president's continuing abuse of power has left us no choice," Schiff said Tuesday. "To do noting would make ourselves complicit in the president's abuse of his high office, the public trust, and our national security."
At a campaign rally Tuesday night in Hersey, Pennsylvania, Trump derided the the articles "flimsy, pathetic" and "impeachment-lite" saying they don't allege "bribery" or any other "crimes."
The Judiciary Committee adjourned at about 10:30 p.m and will pick back up on Thursday at 9 a.m.