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 MurraySenate confirms Trump's nominee to lead FDA Overnight Health Care — Presented by That's Medicaid — Deal on surprise medical bills faces obstacles | House GOP unveils rival drug pricing measure ahead of Pelosi vote | Justices to hear case over billions in ObamaCare payments Obstacles remain for deal on surprise medical bills MORE (Wash.) and Ron WydenRonald (Ron) Lee WydenSenators zero in on shadowy court at center of IG report Trump administration approves Medicaid work requirements in South Carolina Senate Republicans air complaints to Trump administration on trade deal MORE (Ore.) in a letter to Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSenate gears up for battle over witnesses in impeachment trial McConnell: I doubt any GOP senator will vote to impeach Trump McConnell says he'll be in 'total coordination' with White House on impeachment trial strategy MORE (R-Ky.) and GOP Sens. Orrin HatchOrrin Grant HatchKey Republicans say Biden can break Washington gridlock Trump awards Medal of Freedom to racing industry icon Roger Penske Trump holds more Medal of Freedom ceremonies than predecessors but awards fewer medals MORE (Utah) and Lamar AlexanderAndrew (Lamar) Lamar AlexanderWays and Means Committee announces rival surprise medical billing fix Impeachment surprise: Bills Congress could actually pass in 2020 Overnight Health Care — Presented by That's Medicaid — Deal on surprise medical bills faces obstacles | House GOP unveils rival drug pricing measure ahead of Pelosi vote | Justices to hear case over billions in ObamaCare payments 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 Republicans air complaints to Trump administration on trade deal Senate passes Armenian genocide resolution Houston police chief stands by criticism of McConnell, Cruz, Cornyn: 'This is not political' 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 McCainJeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House panel debates articles of impeachment Budowsky: Would John McCain back impeachment? 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 CollinsSenate gears up for battle over witnesses in impeachment trial McConnell: I doubt any GOP senator will vote to impeach Trump Democrats spend big to put Senate in play MORE (Maine) and Rand PaulRandal (Rand) Howard PaulPentagon to take bigger role in vetting foreign students after Pensacola shooting Overnight Defense: House passes compromise defense bill | Turkey sanctions advance in Senate over Trump objections | Top general says military won't be 'raping, burning and pillaging' after Trump pardons Rand Paul: 'We need to re-examine' US-Saudi relationship after Florida shooting MORE (Ky.) are both currently expected to vote against proceeding to the bill.  

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