A group of House Democrats is pushing back against a contentious proposal that would make it tougher for Minority Leader Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) — or any Speaker hopeful — to secure the party’s nomination.

In a “Dear Colleague” letter sent Monday, more than a dozen Pelosi allies urged fellow caucus members to reject the proposed internal rule change, which would significantly raise the threshold that it takes to become the party’s nominee. The group said such a change would undermine “Democratic unity, coherence and effectiveness.”

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“Now that we are finally in the Majority, it will be baffling to the public and self-defeating to block the Caucus’ choice on the floor, either through a formal change to the Rules or an informal abandonment of the Caucus,” the lawmakers wrote. "We should stand by the Rules which have served us well rather than alter our long-standing Rules and court strategic mischief and endless ballots."

The letter is signed by 14 House Democrats, including Reps. Lois Frankel Lois Jane FrankelShakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' Florida Democrat introduces bill to recognize Puerto Rico statehood referendum Hillicon Valley: Democrats demand answers over Russian interference bulletin | Google Cloud wins defense contract for cancer research | Cyberattack disrupts virtual classes MORE (Fla.), Eric Swalwell Eric Michael SwalwellSwalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions Swalwell: Barr has taken Michael Cohen's job as Trump's fixer MORE (Calif.), Jan Schakowsky Janice (Jan) Danoff SchakowskyAhead of a coronavirus vaccine, Mexico's drug pricing to have far-reaching impacts on Americans With Biden, advocates sense momentum for lifting abortion funding ban Hillicon Valley: Facebook removed over 22 million posts for hate speech in second quarter | Republicans introduce bill to defend universities against hackers targeting COVID-19 research | Facebook's Sandberg backs Harris as VP pick MORE (Ill.), Jamie Raskin Jamin (Jamie) Ben RaskinOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security House panel pulls Powell into partisan battles over pandemic Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (Md.) and Doris Matsui Doris Okada MatsuiDemocratic lawmaker calls telehealth expansion the 'silver lining' of pandemic The Hill's 12:30 Report: Delegates stage state-centric videos for the roll call Overnight Health Care: Obama leans into Trump criticism on coronavirus | CDC gives 3-month window for COVID-19 immunity MORE (Calif.).

“It is also troubling to hear reports that Members are being urged to repudiate the choice of the Caucus before we have even met. Just as Nancy Pelosi’s supporters should fairly hear out other candidates, her skeptics should hear her out too,” they said.

The proposal in question would have required any Democrat seeking the Speaker’s gavel to secure 218 votes during the closed-door caucus vote that occurs prior to a public floor vote with the entire House. The current threshold for winning the nomination requires just a simple majority of the caucus.

The idea was championed by a small yet vocal group of Democratic insurgents who are fighting for generational change at the very top of the party and want to nudge the 78-year-old Pelosi out of the leadership ranks.

Initially, 11 Democrats signed a letter pushing for the rule change before the midterm elections, but they ultimately withdrew their effort for the sake of party unity. Last week, nine Democrats again signed on to a similar letter.

Rep. Ed Perlmutter Edwin (Ed) George PerlmutterCongress needs to finalize space weather bill as solar storms pose heightened threat OVERNIGHT ENERGY: 20 states sue over Trump rule limiting states from blocking pipeline projects | House Democrats add 'forever chemicals' provisions to defense bill after spiking big amendment | Lawmakers seek extension for tribes to spend stimulus money House Democrats add some 'forever chemicals' provisions to defense bill after spiking major amendment MORE (D-Colo.), a Pelosi opponent who sponsored the internal rule change, said it's unclear if his amendment will receive a vote ahead of the leadership elections, which are scheduled for Nov. 28.

"That remains to be seen ... whether we even take a vote on Rule 34 or not," he said. "What I asked for is that we have a discussion about it next week. … Not a vote, a discussion.”

His amendment would also change the language of the current rule to reflect that, when a majority of the caucus votes to pick the Speaker nominee, it does not bind all members to support that nominee on the floor.

Mike Lillis contributed.