Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) said Thursday that Senate GOP leaders are "sadly mistaken" if they believe that the party will not try to revive its efforts to repeal ObamaCare in 2018.

"To those who believe — including Senate Republican leadership — that in 2018 there will not be another effort to Repeal and Replace Obamacare — well you are sadly mistaken," Graham wrote on Twitter.

To those who believe – including Senate Republican leadership – that in 2018 there will not be another effort to Repeal and Replace Obamacare -- well you are sadly mistaken. https://t.co/peDYlJx1vo — Lindsey Graham (@LindseyGrahamSC) December 21, 2017

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Graham said in a series of tweets that he remained committed to repealing former President Barack Obama Barack Hussein ObamaThe Memo: Trump's strengths complicate election picture Obama shares phone number to find out how Americans are planning to vote Democrats' troubling adventure in a 'Wonderland' without 'rule of law' MORE's signature health-care law, and called on Republican leadership in the House and Senate to take on the efforts as enthusiastically as Democrats did when they passed the law in 2010.

“It will be a difficult task but failure is not an option,” he wrote.

It will be a difficult task but failure is not an option. — Lindsey Graham (@LindseyGrahamSC) December 21, 2017

Graham's comments came in response to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE's (R-Ky.) suggestion on Thursday that the Senate would likely seek to move past its efforts to repeal ObamaCare in 2018, telling NPR that the caucus would focus on other issues instead.

McConnell said that by including a repeal of ObamaCare's mandate that most individuals have health insurance in Republicans' sweeping rewrite of the tax code, which passed both chambers this week, the GOP had already taken the "heart" out of the health-care law.

President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE also said this week that repealing the individual mandate meant that Republicans had "essentially repealed ObamaCare."

But Graham said Thursday that, while the individual mandate repeal may have been a win for the GOP, it did not amount to a full repeal of the Affordable Care Act.

“By eliminating the individual mandate in the tax bill we have pulled one of the pillars of Obamacare out. But by no means has Obamacare been repealed or replaced," he tweeted.