Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) says repealing ObamaCare without a replacement plan would be a "humanitarian disaster of incomprehensible scale."

"[The Congressional Budget Office] scored repeal without a replacement - it's a humanitarian disaster of incomprehensible scale. 32M lose insurance. Premiums go up 100%," Murphy tweeted late Monday.

CBO scored repeal without a replacement - it's a humanitarian disaster of incomprehensible scale. 32M lose insurance. Premiums go up 100%. — Chris Murphy (@ChrisMurphyCT) July 18, 2017

After the Senate GOP's ObamaCare replacement plan fell apart Monday evening, Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) said Republicans would try repealing ObamaCare now and push replacement efforts until after the 2018 midterm elections, a move President Trump and a growing number of Republicans support.

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Repealing portions of ObamaCare without enacting a replacement could leave 18 million people without health insurance the following year, according to a report earlier this year by the nonpartisan CBO.

Most of the reductions in coverage would be from repealing the penalty for not having health insurance, the CBO estimated, because people would just drop their insurance plans.

After the elimination of ObamaCare's Medicaid expansion and insurance subsidies, 27 million people would lose insurance, growing to 32 million in 2026, the CBO found.

The CBO is responsible for scoring the impact of legislation on the deficit. But Republicans have questioned the office's reports, which have regularly said repealing ObamaCare would increase the deficit and lead to greater levels of uninsured people.