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 MurrayPlaintiff and defendant from Obergefell v. Hodges unite to oppose Barrett's confirmation Overnight Health Care: Trump takes criticism of Fauci to a new level | GOP Health Committee chairman defends Fauci | Birx confronted Pence about Atlas Government watchdog to investigate allegations of Trump interference at CDC, FDA MORE (Wash.) and Ron WydenRonald (Ron) Lee WydenPlaintiff and defendant from Obergefell v. Hodges unite to oppose Barrett's confirmation Senate Democrats call for ramped up Capitol coronavirus testing House Democrats slam FCC chairman over 'blatant attempt to help' Trump MORE (Ore.) in a letter to Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellOvernight Health Care: Following debate, Biden hammers Trump on coronavirus | Study: Universal mask-wearing could save 130,000 lives | Finger-pointing picks up in COVID-19 relief fight On The Money: Finger-pointing picks up in COVID-19 relief fight | Landlords, housing industry sue CDC to overturn eviction ban Finger-pointing picks up in COVID-19 relief fight MORE (R-Ky.) and GOP Sens. Orrin HatchOrrin Grant HatchMellman: What happened after Ginsburg? Bottom line Bottom line MORE (Utah) and Lamar AlexanderAndrew (Lamar) Lamar AlexanderThe Hill's Morning Report - Sponsored by Goldman Sachs - Two weeks out, Trump attempts to rally the base McConnell aims for unity amid growing divisions with Trump Overnight Health Care: Trump takes criticism of Fauci to a new level | GOP Health Committee chairman defends Fauci | Birx confronted Pence about Atlas 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 CruzSenate GOP to drop documentary series days before election hitting China, Democrats over coronavirus Democrats play defense, GOP goes on attack after Biden oil comments Quinnipiac poll finds Biden, Trump tied in Texas 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 McCainMark Kelly releases Spanish ad featuring Rep. Gallego More than 300 military family members endorse Biden Jennifer Lawrence says until Trump she was 'a little Republican' 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 CollinsMcConnell tees up Barrett nomination, setting up rare weekend session Collins says running as Independent 'crossed my mind' Republicans advance Barrett's Supreme Court nomination after Democrats boycott committee vote MORE (Maine) and Rand PaulRandal (Rand) Howard PaulMichigan Republican isolating after positive coronavirus test GOP Rep. Mike Bost tests positive for COVID-19 Top Democrats introduce resolution calling for mask mandate, testing program in Senate MORE (Ky.) are both currently expected to vote against proceeding to the bill.  

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