Democrats are fighting among themselves over how far to go to oppose Supreme Court nominee Brett Kavanaugh and tempers are starting to flare ahead of a decision that could weigh heavily on the midterm elections.

Liberal activists, who are closely aligned with the party’s base, are losing patience with centrist Democrats who are on the fence over Kavanaugh, a judge with impressive credentials and the approval of the conservative Federalist Society.

But Senate Democratic leaders don’t want to twist the arms of vulnerable colleagues up for reelection in pro-Trump states, adding to the disappointment of activists.

“There’s a great deal of frustration,” said Neil Sroka, spokesman for Democracy for America, a liberal advocacy group that is pressing Senate Democrats to unify immediately against Kavanaugh.

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“We need to be training all of our firepower on Murkowski and Collins and we don't need to be wasting one shred of energy trying to push a Democrat in the right direction on this extremist nominee,” he added, referring to moderate Republican Sens. Susan Collins Susan Margaret CollinsClub for Growth to spend million in ads for Trump Supreme Court nominee Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (Maine) and Lisa Murkowski Lisa Ann MurkowskiClub for Growth to spend million in ads for Trump Supreme Court nominee Pebble Mine CEO resigns over secretly recorded comments about government officials Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election MORE (Alaska), who are viewed as potential swing votes.

“There’s great deal of impatience amongst the grass roots for senators to get off the fence on Kavanaugh,” Sroka added.

Liberal activists argue that if Democrats unify early against Kavanaugh, it will put more pressure on Collins and Murkowski to oppose him, just as they opposed efforts to repeal ObamaCare in 2017 after Democrats unified against that effort.

“We’re looking for more clean statements of opposition from more senators,” said Elizabeth Beavers, associate policy director at Indivisible Project, a liberal advocacy group dedicated to defeating President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's agenda.

“We already know plenty about Kavanaugh,” she said. “In order to get on Trump’s shortlist, these people had to show willingness to gut reproductive rights and show hostility to the Affordable Care Act.”

Brian Fallon, the executive director of Demand Justice, a group that plans to spend $5 million on ads pressuring senators to oppose Kavanaugh, this week made a splash when he called out Sen. Tim Kaine Timothy (Tim) Michael KaineDemocrats call for declassifying election threats after briefing by Trump officials Buttigieg stands in as Pence for Harris's debate practice Trump meets with potential Supreme Court pick Amy Coney Barrett at White House MORE (D-Va.) for taking a cautious approach to the nominee.

In a tweet, Kaine said he was “wondering” whether Kavanaugh would rule to uphold the Affordable Care Act, protect women’s right to an abortion and safeguard civil liberties.

Fallon pushed back with a sharply-worded tweet of his own: “We already know the answers to these questions, Tim Kaine. Stop playing political games and help us #StopKavanaugh.”

It was unusual public spat between two Democrats who had prominent roles on Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE’s 2016 presidential campaign — Kaine was her running mate and Fallon her spokesman.

Kaine on Thursday defended himself, comparing Democrats who want a snap judgment on Kavanaugh to Republicans who refused to give a hearing to Merrick Garland Merrick Brian GarlandPoll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Chief justice honors Ginsburg: 'When she spoke, people listened' MORE, former President Obama’s nominee to the Supreme Court in 2016.

“That’s just not the way I take the Supreme Court,” Kaine told The Hill. “I tried cases for 17 years, I’ve appointed [state] Supreme Court justices as governor. I certainly have opinions but I do feel like I’m supposed to read opinions, I’m supposed to read articles, I’m supposed to have an in-office interview [of] any Supreme Court nominee."

Kaine said that if he comes out immediately against Kavanaugh, he might not get a chance to meet the nominee and ask him about his views.

He argued that Fallon also “criticized the Republicans for not being willing to meet with Merrick Garland.”

“I want to extend that courtesy that they wouldn’t extend to Garland,” he said.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) refused to meet with Obama’s nominee in 2016 and Garland never received a confirmation vote.

Ross Baker, a professor of political science at Rutgers University, said that Senate Democratic Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (N.Y.) is going to feel pressure from the base to crack the whip on centrists.

“He’s answerable to the base,” he said.

But Baker doesn’t think there’s much Schumer can do to pressure centrist Democrats.

“They’re going to have their votes conform to what their reading is of the voters in North Dakota or West Virginia.”

Sens. Heidi Heitkamp Mary (Heidi) Kathryn HeitkampHarris faces pivotal moment with Supreme Court battle Centrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents MORE (N.D.) and Joe Manchin Joseph (Joe) ManchinManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House MORE (W.Va.) are two red-state Democrats up for reelection this year.

Senate Democratic Whip Dick Durbin Richard (Dick) Joseph DurbinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death Democrats shoot down talk of expanding Supreme Court MORE (Ill.) told reporters this week that there would not be an effort to whip red-state Democrats.

“They just don’t get it,” he said of liberal activists. “That’s counterproductive. Chuck Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE gets tough with senators. You know how that plays back home?”

Another head-turning moment came Thursday when Adam Jentleson, the former deputy chief of staff to Sen. Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.) said Democrats should use the year-end government funding bill as leverage to press Republicans to turn over sensitive documents from Kavanaugh’s time as White House staff secretary under George W. Bush.

He argued in a Washington Post op-ed that Kavanaugh’s internal communications during the Bush administration “could shed light on his views on executive power and other critical issues that will probably come before the court.”

If Republicans refuse to make those documents available, “Democrats should force the issue by using the substantial power of the minority to grind the Senate to a halt,” including funding of the government beyond Sept. 30.

That bold suggestion was immediately rejected by Senate Democratic strategists.

“What a genius,” said one Democratic aide derisively.

A Democratic strategist close to a red-state senator called the idea “crazy.”

“Here’s the brutal reality: Unless that there’s new polling that I’m not aware of, this does not rank as one of the top five issues for the voters that end up deciding the red-state races,” the source said.

The strategist warned that it could backfire on Democrats if they “come out right off the bat and say 'we’re going to oppose him at all costs' irrespective of what they find.”

“I don't think that’s going to play well at the Senate level,” the source said. “It ain’t California and New York that’s electing a senator from Montana.”

Democrats facing tough reelections this year in states that Trump won by big margins also don’t want to get mixed up in a potential government shutdown a month before Election Day.

Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (D-Mont.) earlier this year panned Democratic threats to hold up a government funding measure over immigration as “stupid talk.”

But other Democrats think the year-end funding bill is fair game after McConnell triggered the nuclear option last year to strip the minority party’s power to filibuster Supreme Court nominees.

“The nuclear option was dropped on the process,” noted former Sen. Ben Nelson (D-Neb.), who represented a Republican-leaning state when he served in Congress and who played a prominent role in negotiating a compromise over appellate-level judicial nominees in 2005.

“I understand why they would use everything they possibly could because they’re not in the position they once were with 60 votes,” he said.

McConnell used a party-line vote last year to change Senate precedent and lower the threshold for confirming Supreme Court nominees from 60 votes to a simple majority.

Changing procedural rules with a party-line vote is so controversial that it’s likened in the Senate to using a nuclear weapon in warfare.

Nelson said Republicans should expect a bitter fight over the Bush-era documents because they are central to judging Kavanaugh’s record.

“When you nominate someone with a partisan background, it’s going to be very difficult not to disclose their partisan activities,” he said.

“I’m sure that some people will think these are extraordinary circumstances because they’re worried about what’s in those emails.”