Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' The Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination MORE (R-Wis.) told CNN’s Dana Bash that he will vote against a motion to proceed to the Senate's healthcare bill if the vote is held this week.

He became the fourth GOP senator to say Monday that he will not vote to move forward the Senate’s bill to repeal and replace ObamaCare in its current form.

New: @RonJohnsonWI just told me if senate gop leadership insists on moving to h care this week he will vote against motion to proceed. — Dana Bash (@DanaBashCNN) June 27, 2017

Three other senators said they would vote against the motion to proceed; Republican Sens. Rand Paul Randal (Rand) Howard PaulRon Paul hospitalized in Texas The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Rand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case MORE (Ky.), Susan Collins Susan Margaret CollinsDemocratic senator to party: 'A little message discipline wouldn't kill us' Poll: 57 percent of Americans think next president, Senate should fill Ginsburg vacancy On The Trail: Making sense of this week's polling tsunami MORE (Maine) and Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE (Nev.) each said they wouldn’t support the measure in its current form.

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The defections come hours after the Congressional Budget Office (CBO) analysis of the measure said it would cause 22 million more Americans to be uninsured in 10 years.

Five GOP senators, including Heller, said last week they wouldn’t vote for the bill in its current form.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.) can only afford to lose two votes on the bill and still rely on Vice President Pence to break a tie.