Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) said Monday that he does not believe the Senate will pass a major healthcare bill before the end of the year.

"I don’t think there will be. I just don’t think we can put it together among ourselves,” Graham said about passing the bill this year, Bloomberg reported.

Graham's remarks come as Senate Republicans plan to meet Tuesday to discuss options to repeal and replace ObamaCare, as the Senate GOP's healthcare working group considers the details of the Senate plan.

While upper chamber leaders like Senate Majority Whip John Cornyn John CornynQuinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (R-Texas) have pressed senators to finish healthcare by the end of July, Graham and Sen. Richard Burr Richard Mauze BurrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs Rep. Mark Walker says he's been contacted about Liberty University vacancy MORE (R-N.C.) have questioned if healthcare can be done in 2017.

The Republican-majority House passed a bill in early May that repeals and replaces key provisions of ObamaCare, which many Republican lawmakers have vowed to repeal. The vote is now in the hands of upper chamber.

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Some Senate Republicans hope to have a Congressional Budget Office (CBO) score before voting on the legislation on July 4, The Wall Street Journal reported Monday.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) admitted last week it may be hard to garner enough votes for the healthcare legislation.

“I don’t know how we get to 50 [votes] at the moment,” McConnell said, referring to the healthcare bill.

While Republicans have majority power in the upper chamber with 52 seats, just two GOP defections would would likely lead to a 50-50 tie in which Vice President Pence could cast the deciding vote.

Graham previously warned that the GOP healthcare bill "should be viewed with caution" before the CBO had come out with its score.

The CBO score for the House bill estimated that 23 million more people would become uninsured by 2026 than if ObamaCare remained in place. And the score also said the Republican bill would reduce the deficit by $119 billion over the course of 10 years.