Senate Majority Whip John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (R-S.D.) says he expects the Senate to debate and vote on whether to subpoena additional witnesses and documents on Wednesday of next week if the impeachment trial plays out as anticipated.

Thune spoke to reporters Wednesday night after the first full day of opening arguments, offering a projection for how the rest of phase one of the trial is likely to unfold.

“If you kind of play things out sequentially, you’re looking at — looks like — maybe the middle of next week where we’d be getting to the point of having that vote,” he said, referring to when senators will vote on the crucial question of extending the trial and reviewing additional evidence not covered by the House inquiry.

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But Thune cautioned that the timing depends on the White House and how many questions senators want to ask of the prosecutors and defense.

“It depends entirely I think on how much time the president’s counsel takes and then how much time we take asking questions,” he said.

Senators expect House managers to use three days to make their arguments, taking up Thursday and Friday to finish presenting their case. They have about 15 and a half hours of time left after spending about eight and a half hours laying out the facts of their investigation Wednesday.

Then the president’s defense team has 24 hours over three days to present its own arguments, and senators will have 16 hours to submit questions in writing to the parties.

Thune said he expects the House managers will use almost all of their time. But Trump’s lawyers aren’t expected to make full use of their 24 hours over three days, and senators aren’t expected to use all of their question time. That makes next Wednesday a potentially pivotal day in the Senate trial.

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“When the White House takes up the mantle, we’ll see how much time they use,” he said, adding that questions from senators are more of a wild card. “I think a lot of it will depend on just how much time members want to use to direct questions.”

A trio of Senate moderates — Sens. Susan Collins Susan Margaret CollinsSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-Maine), Lisa Murkowski Lisa Ann MurkowskiSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (R-Alaska) and Mitt Romney Willard (Mitt) Mitt RomneySenate Republicans face tough decision on replacing Ginsburg McConnell says Trump nominee to replace Ginsburg will get Senate vote GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (R-Utah) — have indicated they are willing to consider subpoenaing additional witnesses and evidence once phase one of the trial is completed.

All three voted repeatedly against 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's (D-N.Y.) motions to subpoena various witnesses on Tuesday, but that could change a week from now.

The organizing resolution adopted by the Senate this week states the Senate shall debate and vote on the question of whether it should be in order to debate any motion to subpoena witnesses and documents.

If 51 senators vote to debate and vote on motions for subpoenas, then the trial could be extended for a few more weeks. If the procedural vote fails, then Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellObama 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 (R-Ky.) will move swiftly to bring the two articles of impeachment to the floor for a vote and Trump’s expected acquittal.

“We’ll probably make some assessment when this is concluded whether or not they think that there’s more information, evidence, testimony that will be necessary, and we’ll cross that bridge when we come to it,” Thune said of the moderates.

“I just think the question about where 51 votes are isn’t quite ripe yet. You obviously want to hear both sides of the argument, and our members are going to want to hear what the administration has to say,” he added. “We’ll have some time at the conclusion of ... questions to really sit down and have those family discussions about where people are.”