Senate Minority Leader Charles Schumer Chuck SchumerVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-N.Y.) knocked President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's legal team on Saturday over its defense of Trump in the impeachment trial, saying its arguments made "no sense" and strengthened the Democratic case for witnesses.

Schumer, speaking after the first day of arguments from the White House counsel, noted that Trump's legal team argued there were no eyewitnesses for the Democrats' case, while Democrats want to call individuals with firsthand knowledge to testify.

"The president's counsel did something that they did not intend: They made a really compelling case for why the Senate should call witnesses and documents," Schumer told reporters. "Today, we thank the president's counsel for one thing. They made our case even stronger."

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The Senate is expected to hold a vote next week on whether additional witnesses or documents will be allowed in the Senate trial. Democrats will need four Republicans to vote with them to secure additional testimony and materials.

Schumer on Saturday stopped short of saying he thought they would be able to win over enough Republicans, describing it as a "hard road."

"Do I think it's easy to get four Republicans? Absolutely not. Do I think we have a chance ... and after today, maybe even a little more so?" Schumer asked. "Yes, I do."

Sen. Mitt Romney Willard (Mitt) Mitt RomneyMomentum growing among Republicans for Supreme Court vote before Election Day Toobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote The Memo: Court battle explodes across tense election landscape MORE (Utah) is the only Republican who has specifically said he wants to call 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 and potentially others.

Sens. Lisa Murkowski Lisa Ann MurkowskiMomentum growing among Republicans for Supreme Court vote before Election Day Collins: President elected Nov. 3 should fill Supreme Court vacancy Barrett seen as a front-runner for Trump Supreme Court pick MORE (R-Alaska) and Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Maine) have both signaled they are open to calling witnesses but have argued specific decisions should wait until after opening arguments and questions from senators.

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It's unclear who could give Democrats their fourth GOP vote. Republican leadership and their aides have predicted that a 50-50 vote would fail.

Sen. Lamar Alexander Andrew (Lamar) Lamar AlexanderToobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote Chamber of Commerce endorses McSally for reelection Trump health officials grilled over reports of politics in COVID-19 response MORE (R-Tenn.), who is retiring but close to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.), has been tight-lipped about how he will vote on calling witnesses.

The White House team on Saturday offered a brief two-hour preview of its defense against the two House-passed articles of impeachment. One of their arguments was that the witnesses who testified before the House did not have firsthand knowledge of the discussions around the decision to hold up the Ukraine aid.

Trump's attorneys argued that the president withheld the military aid because of concerns about burden sharing and corruption and that he didn't tie the assistance to the investigations.