Democrats made a final appeal for witnesses in President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE's impeachment trial on Friday as the Senate moved closer to a vote.

House impeachment managers argued that failing to hear from people with firsthand accounts in this case will set a dangerous precedent for future trials.

“We agree with the president’s counsel on this much: This will set a new precedent,” Rep. Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.), the lead impeachment manager, said on the Senate floor.

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“You can bet in every impeachment that follows — whether it is a presidential impeachment or an impeachment of a judge — if that judge or president believes that it is to his or her advantage that there shall be a trial with no witnesses, they will cite the case of Donald J. Trump,” he said.

Schiff also warned that their decision will cause institutional damage by allowing a president to railroad Congress’s impeachment powers, effectively nullifying them in the future. He also argued that acquitting Trump will send a signal that a president can seek to drag down a political opponent for personal gain and obstruct Congress without consequence.

Democrats have alleged that Trump withheld $391 million in U.S. aid to Ukraine and the promise of a White House meeting to pressure Ukrainian President Volodymyr Zelensky to open two politically motivated investigations, including into a 2020 Democratic rival.

While several Republican senators on Thursday and Friday conceded that they believe the president acted inappropriately, they argued it did not amount to an impeachable offense.

All of the House impeachment managers spoke Friday, except House Judiciary Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerSchumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence House passes bill to protect pregnant workers MORE (D-N.Y.), who missed the conclusion of the Senate trial to be with his wife, who is diagnosed with pancreatic cancer.

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Rep. Zoe Lofgren Zoe Ellen LofgrenTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence DHS opens probe into allegations at Georgia ICE facility House passes legislation to boost election security research MORE (D-Calif.), holding up a pocket copy of the U.S. Constitution, ticked off lines from the legal text as she sought to argue that a fair trial would include witness testimony.

“It is up to the Senate how to try this impeachment with fairness, with witnesses, and documents,” Lofgren said. “Please decide for a fair trial that will yield the truth and serve the Constitution and the American people.”

Democrats focused some of their arguments Friday on the need to hear from Trump's former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE, particularly after a new report in The New York Times, citing an unpublished book by Bolton, said he wrote that he had been asked by Trump to set up a meeting between Zelensky and Rudy Giuliani Rudy GiulianiDemocrats fear Russia interference could spoil bid to retake Senate Grand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates MORE, Trump's personal attorney.

Trump's defense team argued once again against the Senate inviting additional witness testimony.

While deputy White House counsel Patrick Philbin countered Schiff's points, he also made an argument focused on precedent.