Ten senators to watch on Trump impeachment trial

As the impeachment spotlight shifts to the Senate, several senators are emerging as early pivotal players as Washington gears up for President TrumpDonald John TrumpCNN's Don Lemon explains handling of segment after Trump criticism NPR reporter after Pompeo clash: Journalists don't interview government officials to score 'political points' Lawyer says Parnas can't attend Senate trial due to ankle bracelet MORE’s trial. 

The rules, where a simple majority can make or break decisions, could throw a curveball into the looming procedural fights that will determine what the trial looks like. Democrats will need four GOP senators to successfully call a witness or request documents, and only three GOP senators to block a Republican motion. 

A handful of senators in both parties will be under the microscope during the proceeding as the press — and leadership — look for areas where members might break ranks. 

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Here are 10 senators to watch: 

Mitch McConnellAddison (Mitch) Mitchell McConnellTrump allies throw jabs at Bolton over book's claims GOP confident of win on witnesses Collins Senate bid threatens to spark GOP rift in Georgia MORE

The Senate majority leader might not have “ball control,” in his words, during the likely weeks-long impeachment trial, but if he keeps most of his caucus united he’ll be able to set the terms of the proceeding. 

McConnell (R-Ky.), who is up for reelection in 2020, has tied himself closely to Trump as he plots the GOP strategy and has pledged “total coordination” with the White House — a promise that earned him bipartisan flack. 

He’s also been able to exert influence on the White House, winning over officials to his view for a shorter impeachment trial with few, if any, witnesses. He’ll need 51 of his 53 members to successfully muscle through his vision. 

Chuck SchumerCharles (Chuck) Ellis SchumerLawyer says Parnas can't attend Senate trial due to ankle bracelet Senate Democrats' super PAC raised million in 2019 As the mental health crisis grows, Puerto Ricans need long-term care MORE

Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerLawyer says Parnas can't attend Senate trial due to ankle bracelet Senate Democrats' super PAC raised million in 2019 As the mental health crisis grows, Puerto Ricans need long-term care MORE (D-N.Y.) is working to gain leverage on Republicans to reach an agreement on the rules of the trial. 

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Though Trump is unlikely to be convicted in the GOP-controlled Senate, which would require 67 votes, Democrats are hoping to force McConnell — or, absent that, at least four GOP senators — to cut a deal on Ukraine-related documents and witnesses including former national security adviser John BoltonJohn BoltonTrump allies throw jabs at Bolton over book's claims GOP confident of win on witnesses Giuliani calls Bolton a 'backstabber' over Ukraine allegations MORE and acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneySenate Republicans to meet Tuesday afternoon on witness question Graham: There will be 51 GOP votes to call Bidens, whistleblower John Kelly: 'I believe John Bolton' MORE

Schumer’s strategy has focused on keeping his caucus united on the procedural fight while launching a blitz to build public support. Absent a deal, he’s warned they’ll force votes during the trial. 

Lamar AlexanderAndrew (Lamar) Lamar AlexanderGOP confident of win on witnesses Republicans signal renewed confidence they'll avoid witness fight The Hill's Morning Report - Bolton charge ups ante in witness showdown MORE

Alexander, an ally to McConnell, has emerged as a senator to watch as the chamber crafts the rules of the impeachment trial. 

The Tennessee Republican’s decision to retire at the end of 2020 coupled with splits from Trump on high-profile votes, including opposing the emergency declaration on the border wall, have sparked speculation that he could be willing to break rank and support calling witnesses. 

Alexander, viewed as a bipartisan dealmaker, has been tight lipped except to say that he hopes McConell and Schumer can get a deal and that he wants it to be a “fair trial.” 

Susan Collins

Collins is viewed as a crucial Republican swing vote on both procedure and convicting or acquitting Trump on the two articles of impeachment. 

The Maine senator is one of a dwindling group of Senate moderates and one of two GOP senators up for reelection in a state won in 2016 by Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonHill.TV's Krystal Ball: Failure to embrace Sanders as nominee would 'destroy' Democratic Party Clinton says she feels the 'urge' to defeat Trump in 2020 Can Democrats flip the Texas House? Today's result will provide a clue MORE.  

She said this week that she is “open” to calling witnesses but that a specific decision on who, if anyone, needs to testify should wait until after both sides have presented their arguments and senators have asked questions. 

She also knocked both McConnell and Democrats for taking a position on the outcome of the trial, saying that it was "inappropriate ... for senators on either side of the aisle to prejudge the evidence before they have heard what is presented to us.” 

Doug Jones

Jones is viewed as a potential swing vote in the Democratic caucus because of the Alabama senator’s status as the most vulnerable Senate incumbent on the ballot next year.

Jones has called for a “a full, fair, and complete trial” including additional witnesses and documents. But he’s stopped short of saying how he will vote at the end of the Senate proceeding. 

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“If those dots aren't connected and there are other explanations that I think are consistent with innocence, I will go that way too,” he told ABC News. 

Joe ManchinJoseph (Joe) ManchinThe Hill's 12:30 Report: Trump lawyers to offer closing arguments on day 7 Senators ready for question time in impeachment trial The Hill's Morning Report - Report of Bolton tell-all manuscript roils Trump defense MORE

The West Virginia senator is another Democrat to watch during the votes on whether to convict or acquit Trump. 

Manchin, who won reelection in 2016, votes with Trump more than any other Democratic senator currently in office, and Trump is popular in his state. Manchin was the only Democrat to vote for Justice Brett KavanaughBrett Michael KavanaughCollins challenger Sara Gideon raises .5 million in fourth quarter of 2019 Democrats Manchin, Jones signal they're undecided on Trump removal vote Collins walks impeachment tightrope MORE’s Supreme Court nomination last year. 

Manchin has thrown his support behind calling witnesses but characterized himself as undecided when it comes to supporting impeachment. 

Lisa MurkowskiLisa Ann MurkowskiGOP confident of win on witnesses Republicans signal renewed confidence they'll avoid witness fight Trump's team rests, calls for quick end to trial MORE

Murkowski has emerged as a leading moderate during the Trump administration, casting votes against ObamaCare repeal and Kavanaugh’s confirmation. 

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The Alaska senator, who once lost a primary and saw her party battle to unseat her in a general election, has declined to tip her hand on impeachment beyond urging McConnell and Schumer to get a deal on the trial proceedings. 

She captured headlines over the recess when she told an Alaska TV station that she was “disturbed” by McConnell’s pledge to coordinate with the White House on impeachment. 

But she was also critical of the House process, arguing that if House Democrats wanted to hear from Mulvaney and Bolton, who both defied subpoenas to appear, “then that next step is to go to the courts.” House Democrats warned at the time that the White House could drag out the court battle for months. 

Rand PaulRandal (Rand) Howard PaulTrump allies throw jabs at Bolton over book's claims Overnight Defense: White House threatens to veto House Iran bills | Dems 'frustrated' after Iran briefing | Lawmakers warn US, UK intel sharing at risk after Huawei decision Foreign Relations Democrats 'deeply frustrated' after Iran briefing MORE

Paul (R-Ky.) has emerged as a vocal defender of the president when it comes to impeachment, but he warned in November that he could vote against a rules resolution if it limits witnesses and blocks the whistleblower from being called to testify.

He separately told reporters that he could force a vote to call Hunter Biden, former Vice President Joe BidenJoe BidenPerry delegation talking points stressed pushing Ukraine to deal with 'corruption' GOP senator airs anti-Biden ad in Iowa amid impeachment trial Biden photobombs live national news broadcast at one of his rallies MORE’s son, to testify and floated quickly dismissing the articles of impeachment, a motion he could try to make from the floor during the trial. 

The two actions run counter to a growing consensus within the Senate Republican Conference that there should be a speedy trial with no witnesses that ends in Trump’s formal acquittal. 

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Paul sidestepped when asked by The Hill last month if he would still push for a dismissal, saying that the “whole idea of the impeachment inquiry was ill-conceived ... so I think the quicker it can be done the better."

Mitt RomneyWillard (Mitt) Mitt RomneyGOP confident of win on witnesses Collins Senate bid threatens to spark GOP rift in Georgia Republicans signal renewed confidence they'll avoid witness fight MORE

Romney, the Republican Party’s 2012 presidential nominee, has been critical of Trump at times in the lead-up to and during the House’s impeachment inquiry. He called Trump’s suggestion that Ukraine or China investigate the Bidens a “brazen and unprecedented appeal” that was “wrong and appalling.” 

But, like Collins and Murkowski, the Utah Republican been tight-lipped and pledged to keep a “completely open mind” during the Senate trial. 

He’s also sidestepped saying if he wants to hear from specific witnesses or if he would support Schumer’s request for live testimony. He told reporters before the break that he was "indifferent" about whether the Senate passes one resolution governing both process and witnesses or handles them in separate resolutions. 

Kyrsten Sinema

Sinema (D-Ariz.), who joined the Senate in 2019, has largely managed to avoid the national spotlight as Washington tries to game out the impeachment trial. 

But the freshman senator quickly emerged as one of the Democratic caucus’s most moderate votes, including voting with Trump nearly 53 percent of the time, according to FiveThirtyEight. That puts her behind only Manchin among sitting Democratic senators when it comes to voting with Trump. 

Sinema is known around the Capitol for being tight-lipped and does not do hallway interviews. But she has indicated that she has not made a decision on final votes, telling KNXV, a TV station in Arizona, that she will go into the trial unbiased.

“As our juror it will be my constitutional duty to approach it with no bias,” she said. “And to listen to the arguments presented by both sides.”