House Democrats are poised Thursday to dig deeper into their impeachment case that President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE is unfit for office, focusing the second day of the Senate trial on the charge that Trump abused his power in office.

House Intelligence Committee Chairman 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.) said the impeachment managers team plans to use the evidence laid out Wednesday to support their first article of impeachment: Abuse of power.

“Tomorrow, we will go through the law, the Constitution and the facts as they apply to Article I,” Schiff said at the conclusion of the arguments on Wednesday night. “We’ve introduced the case, we have gone through the chronology and tomorrow we will apply the facts to the law as it pertains to the president’s abuse of power."

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If the first day of arguments is any indication, Democrats will spend more than eight hours — sprinkled with a couple breaks — arguing that Trump should be removed from office over charges that he sought to recruit a foreign power to interfere in the 2020 election. Trump, the Democrats contend, pressed Ukrainian leaders last summer to investigate former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE, a leading contender in the presidential race, to boost his own reelection prospects.

"His scheme was undertaken for a simple but corrupt reason: to help him win reelection in 2020,” Schiff said earlier in the day. “But the effect of his scheme was to undermine our free and fair elections and place our national security at risk."

The Senate trial is expected to start at 1 p.m., meaning it should conclude roughly around 10 p.m., according to the schedule the proceeding has followed thus far. Senators are expected to have closed-door caucus lunches before the trial starts, giving them a chance to plot strategy before they sit silently on the floor for hours on end.

On Wednesday, while other impeachment managers took to the podium for short shifts throughout the session, Schiff — the lead impeachment manager — handled the brunt of the presentation himself.

Schiff, prior to taking the Senate floor, said the House Democrats planned to go into “extensive detail” as they lay out the “factual chronology” of Trump’s alleged pressure campaign to get Ukrainian President Volodymyr Zelensky to open the politically motivated investigations.

Among the points Democrats hammered Wednesday: Trump asking Zelensky in a July 25 phone call to do him a “favor” and look into Biden, the timeline for freezing nearly $400 million in U.S. aid to Ukraine, the alleged pressure campaign by the Trump administration to get Kyiv to investigate Biden, the involvement of Trump's personal lawyer Rudy Giuliani Rudy GiulianiGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates Giuliani criticizes NYC leadership: 'They're killing this city' MORE and the subsequent release of additional information since the House impeached Trump.

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“The president used official state powers — available only to him and unavailable to any political opponent — to advantage himself in our democratic election,” Schiff said in his opening remarks.

Democrats again utilized clips of past witness testimony from the House impeachment inquiry as well as a series of public statements from the president himself to support their case.

The opening arguments are building to a showdown next week over whether or not the Senate will call witnesses.

Conservative allies of Trump’s have floated the idea of “witness reciprocity,” meaning if Democrats are able to subpoena 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, then the White House should be able to call Biden's son Hunter Biden, who has emerged as a fixation for Republicans because of his employment at a Ukrainian energy company.

Sen. Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE (R-Texas), noting that Schiff had referenced Hunter Biden in Wednesday’s arguments, argued that the new mention "not only made his testimony relevant, which it already was, but it is now critical.”

But Democrats closed the door to the idea on Wednesday, with Senate Minority Leader Charles Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE (D-N.Y.) describing it as “off the table.”

"You know, we don’t need to have witnesses that have nothing to do with this that are trying to distract Americans from the truth," Schumer said.

Democrats want to call four witnesses, including Bolton and acting chief of staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE.

It's unclear how much movement the second day of arguments will have within the Senate Republican caucus. Democrats need four GOP senators to vote to call witnesses, but a majority of GOP senators have already said they will vote to acquit Trump.

"I didn't hear anything new at all ... No new material presented," Sen. John Barrasso John Anthony BarrassoOVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium Senators reach compromise on greenhouse gas amendment stalling bipartisan energy bill The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump, Biden battle over vaccine, economy; Congress returns MORE (Wyo.), the No. 3 Republican senator, told reporters after roughly six hours of testimony.

Sen. Tim Scott Timothy (Tim) Eugene ScottAuthor Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' Now is the time to renew our focus on students and their futures GOP lobbyists pleasantly surprised by Republican convention MORE (R-S.C.) said Democrats were using their floor time to create a “rehashing” of its months-long inquiry, which he called a “charade.”

However, at least one GOP senator indicated that he thought his colleagues were learning something new with the House presentations.

"[They’re] hearing the prosecution's case for the first time," said Sen. John Kennedy John Neely KennedyMORE (R-La.). "If you poll the United States Senate, 9 out of 10 senators will tell you they have not read a transcript of the proceedings in the House. And the 10th senator who says he has is lying."

Jay Sekulow Jay Alan SekulowNow, we need the election monitors Judge denies Trump's request for a stay on subpoena for tax records Judge throws out Trump effort to block subpoena for tax returns MORE, Trump's personal lawyer, said the White House team is being "fluid," but they are preparing for Democrats to use their full eight hours on Thursday and Friday, which will be the final day of the managers' opening arguments.

"You tell me? Are they moving too slowly?" Sekulow asked reporters. "They have 24 hours to put their case forward [and] it looks like they will take all 24 hours."

Sekulow indicated on Wednesday night that the White House will not try to dismiss the case — a procedural move GOP leadership said lacked the 51 votes needed in order to pass.

When asked why they weren’t making a motion, Sekulow replied: "Because I want to let them try their case, and we want to try our case because we believe without a question the president will be acquitted."

Alexander Bolton and Mike Lillis contributed