The Senate is preparing to begin President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s impeachment trial on Tuesday, a grueling process that senators expect will be highly partisan and likely drag on past the State of the Union address in early February.

Once Speaker Nancy Pelosi Nancy PelosiMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled 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 Pelosi must go — the House is in dire need of new leadership MORE (D-Calif.) sends the two articles of impeachment to the upper chamber, the Senate will summon Chief Justice John Roberts to swear senators in as jurors before the end of the week.

“We’ll be able to … in all likelihood go through some preliminary steps here this week, which could well include the chief justice coming over and swearing in members of the Senate and some other kind of housekeeping measures,” Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled McConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (R-Ky.) announced Tuesday afternoon.

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The GOP leader said this “would set us up to begin the actual trial next Tuesday.”

The Senate will not start debating a resolution to set up time for the opening arguments of the House prosecutors and the president’s defense team until Tuesday. McConnell indicated he will not reveal the details of the organizing resolution until next week.

It is expected to give House impeachment managers up to 24 hours to argue their case and Trump’s lawyers 24 hours to respond, mirroring the resolution that was used to begin phase one of the 1999 Clinton trial.

The organizing resolution that all 53 GOP senators back, McConnell said, will be “very, very similar” to the 1999 precedent, which also gave senators 16 hours to ask questions after which the Senate considered the question of calling for additional witnesses and evidence.

The divisive question of witnesses will not be considered until after opening arguments and the senators’ question time.

At that point, a majority of senators will decide whether they will hear from senior officials who did not participate in the House inquiry, such as 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 acting White House 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, or subpoena key documents.

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McConnell said the first steps “would set up the arguments by the parties, the prosecutors and the defense, and then the written question period, and after that the more contentious issue of witnesses would be addressed.”

Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) has vowed to force Republicans to vote on the question of witnesses when colleagues debate the initial organizing resolution, but GOP leaders predict his motion will be tabled.

“Do Senate Republicans want to break the lengthy, historical precedent that said witnesses should be at impeachment trial, by conducting the first impeachment trial of a president in history — in history — since 1789 with no witnesses?” he said on the floor Tuesday.

Sen. John Cornyn John CornynAirline job cuts loom in battleground states Senate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE (R-Texas), an adviser to the GOP leadership, dismissed Schumer’s strategy as a political ploy ahead of this year’s elections.

“This is about Sen. Schumer trying to force incumbent senators into tough votes on witnesses. I think that’s where the game is being played at this point,” he said.

So far, Sen. Mitt Romney Willard (Mitt) Mitt RomneyGOP-led panel to hear from former official who said Burisma was not a factor in US policy Joe Biden's dangerous view of 'normalcy' The electoral reality that the media ignores MORE (Utah) is the only GOP senator who says he will likely vote to hear from Bolton and possibly other witnesses.

Sen. Lisa Murkowski Lisa Ann MurkowskiGOP ramps up attacks on Democrats over talk of nixing filibuster OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House Democrats tee up vote on climate-focused energy bill next week MORE (R-Alaska), another swing vote, says she is “curious” to hear from Bolton but on Tuesday said she remains undecided on calling additional witnesses.

“What I want to do is listen to both sides on the opportunity to ask questions and listen to the questions that my colleagues are going to ask and hear those responses and then I want that ability to say whether or not I think I need more, and whether I need to hear more from witnesses,” she said. “Maybe John Bolton, maybe others. Maybe none. Or documentation.”

Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine), another prominent moderate who is up for reelection, has pushed for GOP leaders to include in the organizing resolution language setting up a debate and vote on witnesses. She, however, won’t say how she’ll vote.

Schumer said these statements indicate there’s growing GOP interest in hearing from new witnesses.

“I think there’s a whole bunch who are really seriously entertaining this,” he said, pointing to polls showing that 64 percent of Republicans are calling for additional witnesses and documents.

The president’s legal team must also be formally notified of the start of the Senate trial and given at least two days to respond, which means opening arguments may not start until later next week.

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The timeline could slide, however, depending on what Trump’s lawyers want.

Then-President Andrew Johnson was given 10 days to respond to the start of his impeachment trial in 1868, while Clinton had a week of notice.

Given the delayed start, senators are now wondering if the trial will wrap up by the Presidents Day recess, which is scheduled to start Feb. 15.

If the prosecution, defense and senators use all their allotted time, the first phase of a trial could last six to 10 days, depending on how long senators decide to stay in session each day.

“It’s going to go longer than people think,” warned a veteran Republican senator who was in Congress during Clinton’s 1999 impeachment trial.

A lengthy trial would be a blow to sitting senators running for president, most notably Sens. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.), since it would keep them off the campaign trail. The Iowa caucuses are Feb. 3 with the New Hampshire primary eight days later.

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Senators will be required to sit in their seats during the arguments and may not have electronic devices, which could make for some very long days as the impeachment managers and defense lawyers read through their arguments.

In a setback to the House prosecutors, video presentations will not be allowed on the Senate floor, a prospect that some Democrats feared last month when they urged Pelosi to delay the articles of impeachment in hopes of pressing McConnell to negotiate rules for the trial more to their liking.

Some senators initially expressed hope that the trial could be finished by Feb. 4, when Trump is scheduled to deliver his State of the Union address, but now that timeline looks unlikely.

How long the process lasts depends on whether senators vote after opening arguments to subpoena key witnesses.

“If people decide they want to call witnesses, it could probably go on for a while,” said Senate Majority Whip John Thune John Randolph ThuneThe 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 Senate GOP eyes early exit MORE (R-S.D.), who said ending the trial by early next month is a “fairly tight deadline” that is unlikely to be met.

McConnell warned on Tuesday that if Democrats insist on hearing from Mulvaney, Bolton or other senior administration officials, Republicans will press to subpoena Hunter Biden on his Ukraine-related dealings.

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“We’ll be dealing with the witness issue at the appropriate time into the trial, and I think it’s certainly appropriate to point out that both sides would want to call witnesses that they wanted to hear from,” McConnell said Tuesday when asked about GOP colleagues who want former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE’s son to testify.

Some GOP lawmakers have also called for the anonymous whistleblower, whose complaint triggered the impeachment proceedings, and House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffOvernight 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 Intelligence chief says Congress will get some in-person election security briefings MORE (D-Calif.), who led the House inquiry, to testify at the Senate trial.

“When you get to that issue, I can’t imagine that only the witnesses that our Democratic colleagues would want to call would be called,” McConnell said.

He also made clear the Senate will not vote to immediately dismiss the articles of impeachment, as Trump demanded on Twitter over the weekend.

Trump on Sunday said that anything short of an “outright dismissal” gives “the partisan Democratic witch hunt credibility,” but McConnell said Tuesday there simply aren’t enough votes to do that.

McConnell said “there is little or no sentiment in the Republican conference for a motion to dismiss” the articles of impeachment, adding “our members feel that we have an obligation to listen to the arguments.”