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 MurrayDem senators want hearing on funding for detained migrant children Overnight Health Care — Presented by Purdue Pharma — Trump insists GOP will 'totally' protect people with pre-existing conditions | Landmark opioid bill signed into law | Report finds agencies blindsided by 'zero tolerance' policy Controversial Trump judicial nominee advances after two senators attend hearing MORE (Wash.) and Ron WydenRonald (Ron) Lee WydenCongress should pass bill to prevent stacked taxation of digital purchases Falsehood shames Clapper, Brennan and pledge to protect whistleblowers Midterm stakes high for Silicon Valley MORE (Ore.) in a letter to Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSchumer’s headaches to multiply in next Congress Momentum builds for Dems to take on campaign finance reform Will Trump be partisan brawler or smart dealmaker with Congress? MORE (R-Ky.) and GOP Sens. Orrin HatchOrrin Grant HatchTrump to award Medal of Freedom to Babe Ruth, Elvis, Scalia, Hatch How much power do states have? Supreme Court holds the answer On The Money: Trump says he won't give up tax returns | Likely Dem chair vows to subpoena | Stocks rally on Dem House takeover | Tough midterm for many GOP tax writers MORE (Utah) and Lamar AlexanderAndrew (Lamar) Lamar AlexanderBlackburn keeps Tennessee seat in GOP hands  Overnight Health Care — Presented by Purdue Pharma — Judge urges insurers to drop challenge over non-ObamaCare plans | Azar vows to push ahead with drug pricing proposal | No increase for ObamaCare outreach budget Dems blast Trump rule changes on ObamaCare 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 CruzSchumer’s headaches to multiply in next Congress Cruz raises constitutional concerns over legislation to protect Mueller Dem wins leave behind a more conservative GOP conference 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 McCainTime to start planning for the 2020 presidential transition Meghan McCain posts Veterans Day tribute to father Longtime McCain aide blasts ‘despicable’ GOP claim that Dems are trying to steal Arizona Senate race 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 CollinsDems vow swift action on gun reform next year Collins reiterates call for legislation to protect Mueller investigation GOP nerves on edge after Sinema takes lead over McSally MORE (Maine) and Rand PaulRandal (Rand) Howard PaulSchumer’s headaches to multiply in next Congress GOP pollster says Republicans could break with Trump on Saudi Arabia Overnight Defense: Trump says 15,000 troops could deploy to border | Mattis insists deployment is not 'stunt' | Pompeo calls for Yemen peace talks in November MORE (Ky.) are both currently expected to vote against proceeding to the bill.  

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