Senate Democrats are doubling down on their push for Republicans to hold public hearings on their plan to repeal and replace ObamaCare after a surprise setback has stalled the legislation. 

Senate Minority Leader Charles Schumer (D-N.Y.) and Democratic Sens. Patty MurrayPatricia (Patty) Lynn MurrayOvernight Health Care — Sponsored by PCMA — Trump official won't OK lifetime limits on Medicaid Dems warn against changes to federal family planning program Overnight Health Care: Drug company under scrutiny for Michael Cohen payments | New Ebola outbreak | FDA addresses EpiPen shortage MORE (Wash.) and Ron WydenRonald (Ron) Lee WydenHillicon Valley: Judge rules Trump can't block Twitter users | ISIS content finds a home on Google Plus | Rubio rips ZTE demands as 'terrible deal' | Bill would protect kids' data Wyden presses FBI for information on inflated encryption figures Senate Finance Committee releases 22 opioid bills to mark up in ‘coming weeks’ MORE (Ore.) in a letter to Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellMcConnell says he backs Mueller probe after classified briefing Overnight Finance: Trump signs Dodd-Frank rollback | Snubs key Dems at ceremony | Senate confirms banking regulator | Lawmakers lash out on Trump auto tariffs Senate Dems’ campaign chief ‘welcomes’ midterm support from Clintons MORE (R-Ky.) and GOP Sens. Orrin HatchOrrin Grant HatchSenate Finance Committee releases 22 opioid bills to mark up in ‘coming weeks’ Republicans think Trump is losing trade war McConnell tells senators he might scrap August recess MORE (Utah) and Lamar AlexanderAndrew (Lamar) Lamar AlexanderOvernight Health Care — Sponsored by PCMA — Abortion rights group plans M campaign to flip the House Senate health committee to hold hearing on Trump drug pricing plan Overnight Health Care — Sponsored by PCMA — VA reform bill heads to Trump's desk MORE (Tenn.) on Monday suggested a list of outside groups that could be invited to testify. 

"Given your decision to delay the vote on the Better Care Reconciliation Act, we request that you use this additional time to hold public hearings ... on the policies in the bill, especially the radically conservative Cruz/Lee proposal released to the public only five days ago," they wrote.

The controversial provision, spearheaded by Sen. Ted CruzRafael (Ted) Edward CruzPro-Trump super PAC raises .5 million in 6 weeks Trump has exposed Democratic hypocrisy on prison reform Tapper lists 'conspiracy theories' Trump has shared MORE (R-Texas), would allow insurance providers to sell plans that do not adhere to ObamaCare regulations as long as they sell one plan that does meet the requirements.

The hearings, Democrats argued on Monday, would allow lawmakers to "hear unfiltered and unbiased analysis of ... the bill." They also want Republicans to promise to not move forward with the healthcare bill until they get a complete analysis from the Congressional Budget Office (CBO). 

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The letter comes after Sen. John McCainJohn Sidney McCainSenate panel advances 6B defense policy bill McCain: Trump pardoning Jack Johnson 'closes a shameful chapter in our nation’s history' Trump pardons late boxing champion Jack Johnson MORE's office announced that the Arizona Republican would miss votes this week as he recovers from surgery to remove a blood clot from above his left eye. 

The move left McConnell unable to get the 50 votes needed to move forward from the bill, which was already facing an uphill path. A CBO score had originally been expected be released on Monday, but GOP aides signaled over the weekend that it could be delayed until Tuesday at the earliest. 

Republicans aren't expected to hold public hearings on their legislation. But the Democratic senators' letter comes as critics of the bill are hoping to use the delay to help build enough opposition to sink the measure. 

Democrats need to win over at least one more GOP senator to block McConnell from being able to bring up the healthcare legislation. GOP Sens. Susan CollinsSusan Margaret CollinsOvernight Health Care — Sponsored by PCMA — VA reform bill heads to Trump's desk Senate panel to consider ban on prescription drug 'gag clauses' Pressure rising on GOP after Trump–DOJ fight’s latest turn MORE (Maine) and Rand PaulRandal (Rand) Howard PaulOvernight Energy: Reporters barred from Day 2 of EPA summit | Dems blame Trump for gas price increases | Massachusetts to get new offshore wind farm Senate Democrats look for traction on gas prices GOP Senate primary heats up in Montana MORE (Ky.) are both currently expected to vote against proceeding to the bill.  

--This report was updated at 11:43 a.m.