Sen. Ron JohnsonRonald (Ron) Harold JohnsonCongress sends bill renewing anti-terrorism program to Trump The Hill's Morning Report — Shutdown fallout — economic distress Hillicon Valley: Republicans demand answers from mobile carriers on data practices | Top carriers to stop selling location data | DOJ probing Huawei | T-Mobile execs stayed at Trump hotel as merger awaited approval MORE (R-Wis.) is hedging over whether he'll back the Senate's new ObamaCare replacement bill.

Johnson initially indicated he could back the measure, but told a local newspaper that he's now not so sure because of comments by Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellTSA agents protest government shutdown at Pittsburgh airport The case for Russia sanctions Pompeo planning to meet with Pat Roberts amid 2020 Senate speculation MORE (R-Ky.) suggesting some Medicaid cuts in the bill may not happen.

"I am concerned about Leader [Mitch] McConnell's comments to apparently some of my Republican colleagues — 'Don't worry about some of the Medicaid reforms, those are scheduled so far in the future they'll never take effect,'" Johnson told the Green Bay Press-Gazette in remarks that were first published on Friday.

The Senate GOP bill dramatically reforms and scales back Medicaid funding — a move that is drawing pushback from several key swing votes. But, according to The Washington Post, McConnell is privately telling undecided moderates that some of the deepest cuts to the program will never happen. 

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Johnson stressed he has to "confirm" McConnell's comments, but if that is the Kentucky Republican's pitch it would be a "pretty significant breach of trust" with many conservatives supporting the bill because it includes entitlement reform. 

"I think those comments are going to really put the motion to proceed in jeopardy, whether it's on my part or others," he said. 

Johnson initially said last week that he would vote to proceed to the bill. But according to the Green Bay Press-Gazette, he is now undecided on the vote because of the Medicaid fight. 

A spokesman for Johnson didn't immediately respond to a request for comment. 

The Wisconsin Republican — who was largely written off by GOP leadership during last year's election — was one of four conservative senators who came out against the initial draft of the repeal bill. He previously warned that he would vote against the motion to proceed if it occurred before the July recess. 

Medicaid has emerged as a key sticking point for Republicans as they try to get 50 GOP senators to support their repeal and replace bill. 

With GOP Sens. Susan CollinsSusan Margaret CollinsOvernight Defense: Trump unveils new missile defense plan | Dems express alarm | Shutdown hits Day 27 | Trump cancels Pelosi foreign trip | Senators offer bill to prevent NATO withdrawal McConnell blocks bill to reopen most of government Bipartisan senators reintroduce bill to prevent Trump from withdrawing from NATO MORE (Maine) and Rand PaulRandal (Rand) Howard PaulPressure mounts for Trump to reconsider Syria withdrawal House Republicans call for moving State of the Union to Senate chamber GOP rep: 'Rand Paul is giving the president bad advice' on Afghanistan and Syria MORE (Ky.) expected to vote against the motion to proceed, McConnell cannot afford to lose another Republican.

But several GOP senators, many from states that expanded Medicaid under ObamaCare, remain on the fence and huddled with McConnell in his office late last week. 

Nevada Gov. Brian Sandoval (R) has also been a vocal critic of the bill, which could put pressure on Sen. Dean HellerDean Arthur HellerTrump’s shifting Cabinet to introduce new faces Trump's most memorable insults and nicknames of 2018 Progressive strategist says changing demographics will help Dems MORE (R-Nev.) — who is up for reelection next year — to vote against it. 

Federal Medicaid funding could drop by as much as 39 percent over the next two decades under Senate Republicans' healthcare plan, according to a report presented at the National Governors Association meeting.