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 MurrayCDC director to miss fourth hearing because of potential ethics issues Week ahead: Lawmakers near deal on children's health funding Ryan suggests room for bipartisanship on ObamaCare MORE (Wash.) and Ron WydenRonald (Ron) Lee WydenWeek ahead: Senate takes up surveillance bill This week: Time running out for Congress to avoid shutdown Senate Finance Dems want more transparency on trade from Trump MORE (Ore.) in a letter to Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSessions: 'We should be like Canada' in how we take in immigrants NSA spying program overcomes key Senate hurdle Overnight Finance: Lawmakers see shutdown odds rising | Trump calls for looser rules for bank loans | Consumer bureau moves to revise payday lending rule | Trump warns China on trade deficit MORE (R-Ky.) and GOP Sens. Orrin HatchOrrin Grant HatchKoch groups: Don't renew expired tax breaks in government funding bill Hatch tweets link to 'invisible' glasses after getting spotted removing pair that wasn't there DHS giving ‘active defense’ cyber tools to private sector, secretary says MORE (Utah) and Lamar AlexanderAndrew (Lamar) Lamar AlexanderWeek ahead: Lawmakers near deal on children's health funding Ryan suggests room for bipartisanship on ObamaCare Time to end fiscal year foolishness 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 CruzWith religious liberty memo, Trump made America free to be faithful again Interstate compacts aren't the right way to fix occupational licensing laws Texas Dem: ‘I don’t know what to believe’ about what Trump wants for wall 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 McCainMcCain rips Trump for attacks on press NSA spying program overcomes key Senate hurdle Meghan McCain says her father regrets opposition to MLK Day 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 CollinsDemocrats search for 51st net neutrality vote Overnight Tech: States sue FCC over net neutrality repeal | Senate Dems reach 50 votes on measure to override repeal | Dems press Apple on phone slowdowns, kids' health | New Android malware found Overnight Regulation: Dems claim 50 votes in Senate to block net neutrality repeal | Consumer bureau takes first step to revising payday lending rule | Trump wants to loosen rules on bank loans | Pentagon, FDA to speed up military drug approvals MORE (Maine) and Rand PaulRandal (Rand) Howard PaulNSA spying program overcomes key Senate hurdle Fix what we’ve got and make Medicare right this year Despite amnesty, DACA bill favors American wage-earners MORE (Ky.) are both currently expected to vote against proceeding to the bill.  

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