Sen. Ron JohnsonRonald (Ron) Harold JohnsonAmbassador Gordon Sondland arrives on Capitol Hill for testimony in impeachment inquiry GOP cautions Graham against hauling Biden before Senate Sondland could provide more clues on Ukraine controversy 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 McConnellTurkey sanctions face possible wall in GOP Senate Fox's Wallace says 'well-connected' Republican told him there's a 20 percent chance GOP will vote for impeachment White House staggers after tumultuous 48 hours 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 Energy: Perry to step down as Energy secretary | Future of big-game hunting council up in the air | Dems lose vote against EPA power plant rule Overnight Defense — Presented by Boeing — Pence says Turkey agrees to ceasefire | Senators vow to move forward with Turkey sanctions | Mulvaney walks back comments tying Ukraine aid to 2016 probe On The Money: Senate fails to override Trump veto over border emergency | Trump resort to host G-7 next year | Senators to push Turkey sanctions despite ceasefire | McConnell tees up funding votes MORE (Maine) and Rand PaulRandal (Rand) Howard PaulTurkey sanctions face possible wall in GOP Senate Trump-Graham relationship tested by week of public sparring Overnight Defense — Presented by Boeing — Pence says Turkey agrees to ceasefire | Senators vow to move forward with Turkey sanctions | Mulvaney walks back comments tying Ukraine aid to 2016 probe 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 HellerThis week: Barr back in hot seat over Mueller report Trump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Trump picks ex-oil lobbyist David Bernhardt for Interior secretary 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.