It's unclear whether Senate Republicans have the votes to win on a key procedural motion that would allow them to debate the new healthcare bill they released on Thursday.

Sens. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) and Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Maine) both said they would oppose the motion, meaning 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.) cannot afford another defection on the vote.

Sen. Rob Portman Robert (Rob) Jones PortmanRomney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery House passes B bill to boost Postal Service MORE (R-Ohio) said his position had not changed, but he did not give a clear answer on whether he'd back his party on the procedural vote.

Asked whether he would vote for the motion to proceed, Portman said, “No.”

But he added: “I'm the same position I've been in. I'm looking at the language.”

Sen. Shelley Moore Capito Shelley Wellons Moore CapitoSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure Hillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes MORE (R-W.Va.), who has been an ally of Portman's during the healthcare talks, said she doesn’t know whether she’ll vote to proceed to the bill after hearing a presentation from Senate Republican leaders at the Capitol.

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“We have another meeting this afternoon on the Medicaid cuts,” she told reporters. “I need to really look at it, look at the score, I still have concerns.”

Asked if she would vote for the motion to proceed next week, she said, “Wait and see.”

Capito also said she did not know whether her concerns could be addressed through the amendment process.

“I’m going to hold comment on that.”

GOP moderates are planning to meet later Thursday afternoon to discuss their concerns with the bill, which would phase out federal funding for expended Medicaid enrollment and impose a stricter formula for indexing the program to inflation.

Portman, Capito and two other moderates, Sens. Lisa Murkowski Lisa Ann MurkowskiMomentum growing among Republicans for Supreme Court vote before Election Day Collins: President elected Nov. 3 should fill Supreme Court vacancy Barrett seen as a front-runner for Trump Supreme Court pick MORE (R-Alaska) 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 (R-Nev.), were spotted walking into McConnell’s office shortly after lunchtime.

Heller said he’s on the fence over how to vote on beginning the debate next week.

“No decisions have been made yet so we’ll continue the conversation,” Heller told reporters.

Murkowski on Wednesday argued that Medicaid reforms should be kept separate from legislation repealing and replacing ObamaCare.

She views the adoption of a less generous formula for Medicaid inflation as something outside the scope of the Senate healthcare bill.

“It goes into a level of Medicaid reform, traditional Medicaid reform, that had nothing to do with [the Affordable Care Act,]” she said, using ObamaCare’s formal name.

“Let’s leave Medicaid off the table for right now. Let’s bifurcate this,” she said. “This is not something that, in my view, is best done in a reconciliation process.”

Sen. Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE (R-Texas) said he could support the new bill, a key win for McConnell.

"If this is the bill, I will support this bill," Cruz told reporters after a meeting of GOP senators. "Now, if it’s amended and we lose the protections that lower premiums my view could well change."

Language backed by Cruz was included in the new version, but it's unclear whether it will be retained.

Even with the addition of Cruz, however, McConnell faces more uncertainty.

Sen. Bill Cassidy (R-La.), who teamed up with Collins earlier this year to push alternative legislation, told reporters before a Thursday lunch meeting that he was not sure whether he would vote to let the bill advance.

Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) also voiced dismay with the legislative plan presented to the GOP conference Thursday.

He said he will vote for the motion to begin debate, but complained that the three amendments Arizona Gov. Doug Ducey (R) wanted in the legislation were left out.

Portman and other moderates — with the exception of Collins — did not rule out the possibility of changing their minds before the Senate is expected to vote next week.

Paul has long opposed the bill, arguing it leaves much of ObamaCare in place.

This report was updated at 2:37 p.m.