Senate Republican leaders feel confident they will have the votes to block the Democrats’ attempt to subpoena additional witnesses and documents in 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 impeachment trial, which could allow the proceeding to wrap up by the end of next week.

While the House impeachment managers have one more day to lay out their case against the president, GOP leaders don’t think there are four Republican votes to subpoena additional evidence to extend the trial, according to multiple Senate GOP sources.

Senate Democratic 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 (N.Y.) at most can win three Republican votes to subpoena White House witnesses 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 and likely will not even get that.

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“If I had to bet, it doesn’t get 50,” said one GOP senator, who requested anonymity to discuss internal deliberations.

Fifty votes would mean three GOP defections, one fewer than Democrats need to win.

The GOP senator said there’s little reason for Republicans to join Democrats in their push for witnesses, since it would be granting a significant victory to Schumer and a big defeat to both Trump and 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.).

It could also allow McConnell to call GOP witnesses such as Hunter Biden, the son of the former vice president. McConnell has previously threatened to do so.

“There's a feeling as we hear more about this of, ‘Where will it end if we go down the rabbit hole of more witnesses? How long will it go on if we enter into that Never-Never land?’” said the Republican senator,

So far only two Republicans have said they will likely vote to subpoena witnesses: 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 (Maine) 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 (Utah).

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A third moderate swing vote, Sen. 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), has played her cards close to the vest, giving little indication of which way she’s leaning.

Republican senators and aides say they have a hard time imagining who the fourth Republican to vote for witnesses would be if Murkowski supports a motion for witnesses.

None of the potential candidates, Sens. Lamar Alexander Andrew (Lamar) Lamar AlexanderChamber of Commerce endorses McSally for reelection Trump health officials grilled over reports of politics in COVID-19 response Now is the time to renew our focus on students and their futures MORE (R-Tenn.), Rob Portman Robert (Rob) Jones PortmanRomney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery House passes B bill to boost Postal Service MORE (R-Ohio), Cory Gardner Cory Scott GardnerSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Chamber of Commerce endorses McSally for reelection MORE (R-Colo.), Martha McSally Martha Elizabeth McSallySenate 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-Ariz.) and Jerry Moran Gerald (Jerry) MoranLobbying world This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Hillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes MORE (R-Kan.), have shown much appetite to speak out against the president.

Whoever votes to subpoena Trump’s senior advisers would likely come under withering criticism from the president.

And an acquittal for Trump would still appear certain, since 67 votes would be needed to remove Trump from office.

As a result, a vote for witnesses would give more time for House Democratic prosecutors to make their case, but for little gain to individual Republicans. GOP lawmakers privately say it would be like cutting off your nose to spite your face.

A second Republican senator who requested anonymity to comment on colleagues’ deliberations predicted as many as three Republicans could vote to subpoena witnesses and documents, referring to Collins, Romney and Murkowski, but asserted it’s highly unlike a fourth Republican would do so.

“I don’t see it,” said the lawmaker.

Republican leaders are warning their colleagues that subpoenas of key witnesses and documents is likely to result in a court fight that could stretch the trial for months longer.

“Some of the proposed new witnesses include executive-branch officials whose communications with the president and with other executive-branch officials lie at the very core of the President’s constitutional privilege,” McConnell warned Tuesday.

“Pursuing those witnesses could indefinitely delay the Senate trial and draw our body into a protracted and complex legal fight over presidential privilege,” he added.

Rank-and-file members are starting to echo that argument.

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Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill Second GOP senator to quarantine after exposure to coronavirus GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (R-Wis.) said if four Republicans vote with Democrats to subpoena witnesses and documents it could prolong the trial for “weeks and months.”

“The president does need to defend separation of power and executive privilege,” he added. “It never should have gone to an impeachment inquiry and we shouldn’t be here so I sure don’t want to elongate this process.”

Sen. James Lankford James Paul LankfordMcConnell works to lock down GOP votes for coronavirus bill Charities scramble to plug revenue holes during pandemic Warren calls for Postal Service board members to fire DeJoy or resign MORE (R-Okla.) said parts of Bolton’s and Mulvaney’s testimony will be subject to executive privilege and have to be litigated in the courts, potentially extending the trial until the summer.

“That will take a couple of months to go through the process,” he said, suggesting the House managers want the trial to extend into the summer.

He said the managers want to “drag this trial out as long as possible. That’s really not our responsibility.”

That argument seems to be resonating with Murkowski, who expressed frustration Thursday that the House had not gone to the courts to get the evidence it wanted.

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“The House made a decision that they didn’t want to slow things down by having to go through the courts. And yet now they're basically saying you guys gotta go through the courts. We didn't, but we need you to,” she said Thursday.

Beyond that, Republican moderates are starting to grumble about Democratic tactics more generally.

Two possible swing votes, Murkowski and Collins, said they were “offended” and “stunned,” respectively, by House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence House passes bill to protect pregnant workers House Democrats postpone vote on marijuana decriminalization bill MORE’s (D-N.Y.) argument for subpoenaing Bolton in which he called a vote against consideration of more evidence “treacherous.”

Romney earlier this week suggested that Democrats were overplaying their hand by protesting so vehemently against the trial’s organizing resolution.

“I think the Democrats make a mistake when they cry outrage time and time again. If everything is an outrage, then nothing is an outrage,” he said.