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 MurraySenators press FDA tobacco chief on status of vaping ban Retirement bill blocked in Senate amid fight over amendments Senate Democrats call on White House to abandon plan to collect DNA from migrants MORE (Wash.) and Ron WydenRonald (Ron) Lee WydenDemocratic senators introduce bill to block funding for border wall live stream Booker, Sanders propose new federal agency to control drug prices Hillicon Valley: Amazon to challenge Pentagon cloud contract in court | State antitrust investigation into Google expands | Intel agencies no longer collecting location data without warrant MORE (Ore.) in a letter to Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellOn The Money: Trump asks Supreme Court to block Dem subpoena for financial records | Kudlow 'very optimistic' for new NAFTA deal | House passes Ex-Im Bank bill opposed by Trump, McConnell Top House Democrats ask for review of DHS appointments Warren promises gradual move toward 'Medicare for All' in first 100 days MORE (R-Ky.) and GOP Sens. Orrin HatchOrrin Grant HatchTrump awards Medal of Freedom to racing industry icon Roger Penske Trump holds more Medal of Freedom ceremonies than predecessors but awards fewer medals Trump to award Medal of Freedom to former Attorney General Edwin Meese MORE (Utah) and Lamar AlexanderAndrew (Lamar) Lamar AlexanderPelosi aide hopeful White House will support drug-pricing bill despite criticism Overnight Energy: BLM staff face choice of relocation or resignation as agency moves | Trump says he's 'very much into climate' | EPA rule would expand limits on scientific studies Juan Williams: Republicans flee Trump 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 CruzOvernight Defense: Erdoğan gets earful from GOP senators | Amazon to challenge Pentagon cloud contract decision in court | Lawmakers under pressure to pass benefits fix for military families Erdoğan gets earful from GOP senators at White House Senators confirm Erdoğan played 'propaganda' video in White House meeting 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 McCainDonald Trump's 2020 election economic gamble 2020 Democrats make play for veterans' votes The Memo: Democrats confront prospect of long primary 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 Defense: Erdoğan gets earful from GOP senators | Amazon to challenge Pentagon cloud contract decision in court | Lawmakers under pressure to pass benefits fix for military families Senate confirms controversial circuit court nominee Lawmakers under pressure to pass benefits fix for military families MORE (Maine) and Rand PaulRandal (Rand) Howard PaulTrump: 'Everybody knows who the whistleblower is' Johnson opens door to subpoenaing whistleblower, Schiff, Bidens Senate GOP waves Trump off early motion to dismiss impeachment charges MORE (Ky.) are both currently expected to vote against proceeding to the bill.  

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