GOP Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (S.C.) said Wednesday that Republicans aren’t “cult-like” in their devotion to President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, as his colleague Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) charged, because “you got to be organized” to be a cult.

Graham, leaving a closed-door GOP lunch, said frustrations spilled over among Senate Republicans following Corker's comment and things got "contentious" during the meeting.

Corker, speaking to reporters earlier in the day, had compared the relationship between GOP leadership and Trump to a “cult-like situation.”

Graham said "the whole cult thing" came up behind closed doors.

“The reason I know we’re not a cult, you got to be organized," Graham joked. "I don’t think we’ll ever qualify as a cult."

But senators say there was already deep frustration within the caucus over the current standoff over the defense bill, which has lingered for days amid back-and-fourth finger-pointing off and on the floor.

GOP senators have been blocking fellow Republicans from being able to get a vote on their amendments to a mammoth, must-pass defense policy bill.

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At the center of the debate is a proposal from Corker to require congressional approval if Trump wanted to apply tariffs in the name of national security.

Corker acknowledged that he will not get a vote on his bill as an amendment to the National Defense Authorization Act (NDAA). While he is not blocking other colleagues from getting votes, he is publicly blistering his colleagues for blocking his tariff proposal.

Corker pledged to raise the issue with his colleagues during the lunch. He declined, afterward, to get into specifics about the lunch but characterized it as a “good conversation.” A spokeswoman for Corker didn’t immediately respond to a request for comment.

“Everybody got kind of spirited, but no foul,” said GOP Sen. John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (Texas), asked about the closed door caucus meeting.

Asked if senators expressed frustration during the lunch about their inability to get votes, GOP Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (Wis.) added: “Oh I think that’s safe to say.”

Graham also said after the meeting that he had to apologize for some of the remarks he had made.

“I ran a little hot and I said I’m sorry and that’s a good thing to do. ...Part of it was confusion. I didn’t know what we were talking about. I thought Bob’s amendment was still up,” Graham said with a laugh, asked if he apologized during the meeting.

Corker’s criticism appears to have rankled his colleagues. Cornyn declined to directly respond to Corker, who called him out on the Senate floor on Tuesday, adding that the Tennessee senator’s comments were a “sign of his own frustration and I really don’t feel the need to get into it.”

But asked about Corker’s floor speech this week where he blistered Republicans for blocking his amendment, GOP Sen. Jim Inhofe James (Jim) Mountain InhofeChamber of Commerce endorses McSally for reelection Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Top admiral: 'No condition' where US should conduct nuclear test 'at this time' MORE (Okla.) told Laura Ingraham on Wednesday that Corker “hates the president. So he’s going to do anything he can to inflict damage on Donald Trump.”

Senators are quick to acknowledge that the frustration among Republican senators go beyond Corker’s amendment and to the broader stalemate that is blocking nearly every senator from getting a vote on their proposal to the NDAA.

Under Senate rules, any one senator can block any other senator from getting a vote on an amendment, unless Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) is willing to eat up days of floor time and force the issue.

A spokesman for Sen. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) confirmed that the GOP senator raised concerns during the lunch about the lack of amendment votes.

GOP Sen. Rand Paul Randal (Rand) Howard PaulRand 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 Health officials tell public to trust in science MORE (Ky.) is blocking amendment votes unless he gets a vote on his indefinite detention proposal as part of the Senate’s consideration of the NDAA. But Graham is helping block Paul from getting a vote on his amendment.

Asked if the standoff between the two had been resolved, GOP Sen. Roger Wicker Roger Frederick WickerBottom line Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (Miss.) started laughing before adding: “Well, it isn’t resolved yet.”

GOP Sen. John Thune John Randolph ThuneOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Remote work poses state tax challenges Senate GOP sees early Supreme Court vote as political booster shot MORE (S.D.), the No. 3 Republican senator, indicated that most of the discussion was currently centering around the Graham-Paul standoff.

“There are a lot of discussions about it. There are obviously members who have strong views,” he said, adding that Corker was separately looking for a different bill to bring up the tariff fight on.

The stalemate over votes on the NDAA comes as Republicans are expected to soon start moving appropriations bills on the Senate floor, setting up a potential repeat scenario if GOP senators refuse to back down from the hardball tactics.

“We just had a lengthy discussion about that and we’re trying to work it out. But I can’t honestly say it’s been worked out,” GOP Sen. John Kennedy John Neely KennedyMORE (La.) told reporters. “So what’s going to happen when we get on … appropriations?”

Inhofe, asked separately if Republicans would change their behavior and stop blocking each others' votes, quipped: “That would be nice.”