GOP Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (S.C.) predicted on Tuesday that Senate Republicans won't be able to pass a bill repealing and replacing ObamaCare because of divisions within the caucus.

"If healthcare fails and I think it's more likely to fail than not [with the] Republican Party only," Graham told reporters.

Graham pointed to differences about Medicaid for why he thought Republicans won't be able to get the votes needed to clear their healthcare bill.

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Several moderate senators from states that expanded Medicaid have raised concerns about what happens to individuals covered by the expansion. Meanwhile, a group of conservatives wants to add new requirements to the program.

Republicans have a narrow path to getting their legislation through the upper chamber. They have 52 seats, so they can only lose two GOP senators and lean on Vice President Pence to break a tie.

They are also facing a time crunch to reach a deal with lawmakers saying they want to pass their bill no later than the August recess.

Graham separately told reporters that Sen. Rand Paul Randal (Rand) Howard PaulThe 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 Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts MORE (R-Ky.) was "irretrievably gone" on the healthcare bill, which would mean Republicans can lose one more member before the bill is dead.

Sen. Lindsey Graham says Sen. Rand Paul is "irretrievably gone" on healthcare bill, leaving GOP room for only one more defection — Alex Bolton (@alexanderbolton) June 6, 2017

“While we do have a press assistant opening in the Communications Department, Senator Graham has not applied and should not make public statements on behalf of Senator Rand Paul,” Paul spokesman Sergio Gor said in a statement, however. “Senator Paul remains optimistic the bill can be improved in the days ahead and is keeping an open mind.”

--This report was updated at 3:24 p.m.