Momentum is building in the Senate for doing away with an arcane rule that allows senators to block some of President Trump’s judicial nominees.

The “blue-slip” rule — a precedent upheld by Senate tradition — allows a home-state senator to stop a lower-court nominee by refusing to return a sheet of paper, known as a blue slip, to the Judiciary Committee.

Conservatives have clamored for months to get rid of the rule, arguing Democrats are abusing the process to block qualified nominees.

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They recently gained a powerful ally: Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.), at least when it comes to picks for the U.S. courts of appeals.

"My personal view is that the blue slip, with regard to circuit court appointments, ought to simply be a notification of how you’re going to vote, not the opportunity to blackball,” McConnell told The New York Times.

He added that he supports keeping the blue slip rule for district court judges, whose decisions can get appealed to the circuit court.

With Trump and congressional Republicans struggling to rack up major legislative wins — they have, so far, failed to repeal ObamaCare and tax reform is months behind schedule — the courts offer perhaps the best path for the GOP to make lasting change in the majority.

Trump currently has 144 vacancies to fill in the federal court system, with nominees already named for 45 of those spots. The vacancies include 21 on the circuit court, which span multiple states and ranks only below the Supreme Court.

Because the Senate's "blue slip" practice isn't a rule but a tradition enforced by the Judiciary Committee chairman, the decision on whether or not to move forward ultimately rests with Sen. Chuck Grassley (R-Iowa.). But Democrats are prepared to test the issue.

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Democratic Sens. Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (Ore.) and Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (Ore.) are pledging they will not return their slips for Ryan Bounds, Trump’s ninth circuit pick, or “any other nominee that has not been selected through our judicial process.”

“As senators charged with the task for advice and consent in the selection of candidates, we take our responsibility to identify and recommend candidates to fill Oregon judicial vacancies very seriously,” they wrote in a letter to the White House.

Sen. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.) is also refusing to return his blue slip for David Stras, Trump’s eighth circuit nominee.

In addition to Stras and Bounds, Democratic Sens. Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE (Wis.), Bob Casey Robert (Bob) Patrick CaseySecond GOP senator to quarantine after exposure to coronavirus GAO report finds brokers offered false info on coverage for pre-existing conditions Catholic group launches .7M campaign against Biden targeting swing-state voters MORE (Pa.) and Michael Bennet Michael Farrand BennetOVERNIGHT 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' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (Colo.) have a Trump judicial pick from their home states awaiting a hearing before the Judiciary Committee.

And roughly seven additional circuit court seats that Trump still needs to fill come from states that have at least one Democratic senator, including Minority Leader Charles Schumer Chuck SchumerVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-N.Y.).

Democrats have few other tools to slow down or block a judicial nominee. They did away with the 60-vote filibuster for lower-court nominees when they held the majority in 2013, and Republicans followed suit by ending the filibuster for Supreme Court nominees earlier this year.

A coalition of liberal groups is putting pressure on Democratic senators to oppose any judicial nominee from Trump, who they call “a white supremacist who has no respect for the Constitution and the rule of law.”

“Even though they do not have the numbers to block Trump’s nominees, keeping Trump from being able to fill even a portion of the total vacancies could limit the damage he inflicts on our courts. Senior members of the Judiciary Committee like Sens. Feinstein, Leahy and Klobuchar must commit to total resistance,” CREDO Action wrote in a petition call to its supporters.

Sen. Dianne Feinstein Dianne Emiel FeinsteinMcConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Intensifying natural disasters do little to move needle on climate efforts MORE (D-Calif.) — who has stirred the left’s ire ahead of a potential 2018 reelection bid — is urging Republicans to keep the blue slip tradition.

“It’s the prerogative of home-state senators to evaluate potential federal judicial nominees and determine whether or not they are mainstream and well-suited to hold these important positions of public trust, which have real-world consequences for their constituents,” Feinstein, the ranking member of the Judiciary Committee, said in a recent statement.

Noting that nominees under President Obama didn’t move forward when they didn’t receive blue slips from their home state senators, Feinstein added, “I trust that this refusal to sign a blue slip will be treated the same way.”

Schumer and McConnell are expected to sit down and discuss the issue, though a Senate aide noted on Friday that the meeting hadn’t been scheduled yet.

It’s not the first time the Senate has fought over the blue-slip tradition, which dates back 100 years.

Every GOP senator, including McConnell and Grassley, sent a letter to Obama in 2009 warning that if they weren’t consulted, and didn’t approve of, nominees from their home states they wouldn't let them move forward.

“Despite press reports that the Chairman of the Judiciary Committee now may be considering changing the Committee’s practice of observing senatorial courtesy, we, as a Conference, expect it to be observed, even-handedly and regardless of party affiliation. And we will act to preserve this principle and the rights of our colleagues if it is not,” the entire caucus wrote in the letter.

Christopher Kang, a former deputy counsel for Obama, noted in a Huffington Post op-ed that Republicans blocked 18 Obama nominees by refusing to return a blue slip, including six circuit court picks.

Grassley has, so far, not said what he will do when a home-state senator opposes a nomination. But he’s hinted that the blue-slip rule could go by the wayside, at least in same cases.

“It’s much more a White House decision on circuit judges than the district court judges,” Grassley said during an interview on C-SPAN’s “Newsmakers” program. “I mean, this is going to be an individual case-by-case decision, but it leads me to say that there’s going to have to be a less strict use or obligation to the blue-slip policy for circuit, because that’s the way it’s been.”

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A Congressional Research Service report noted that, “since 1979, the impact of negative blue slips has varied as leadership in the Senate Committee on the Judiciary has changed.”

If Grassley ultimately does decide to move forward on the nominations being objected to by Democrats, he’ll have the support of other top GOP senators and conservatives to give him cover.

“We’ve never really had an absolute blue-slip process on circuit court judges, so if the Democrats are trying to do that, that’s wrong,” said Sen. Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (R-Utah), a former Judiciary Committee chairman.

But Hatch, as a member of the minority in 2014, also touted his protection of the “blue-slip tradition,” noting that, “not one appeals court nominee was confirmed without the support of their home-state senators.”

Sen. John Cornyn John CornynCalls grow for Biden to expand election map in final sprint Bipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection MORE (R-Texas), the No. 2 Senate Republican, added “there’s consultation, which is important, but we’re not going to let an individual senator reverse the outcome of the last presidential election.”

Any changes Republicans make to the Senate’s traditions or rules while they are in the majority could come back to bite them when they are back in the minority.

Cornyn, asked if he was worried about the potential implications down the road, acknowledged it was a reality Republicans could face.

“Well the Democrats have shown they are willing to go to extreme measures anyways,” he said, “so I wouldn’t be surprised.”