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Collins complained about the group at a meeting of the Senate Republican Steering Committee last week.

She warned her colleagues that infighting among Republicans could give Democrats a good chance of capturing her seat in 2014, when she faces reelection, according to The New York Times, which reported on the private argument.

Sen. Rob PortmanRob PortmanRepeal of Obama drilling rule stalls in the Senate Chamber pressures red-state Dems to back Trump on cutting regs GOP govs: ObamaCare repeal bill shifts 'significant' costs to states MORE (R-Ohio) stood up at the meeting to express frustration that Collins had to use money he donated her to fend of attacks from the National Association of Gun Rights.

Paul, feeling attacked, stormed out of the meeting, according to The Times.

The senator on Wednesday said he does not plan to support primary challenges against any of his Republican Senate colleagues, although he might lend his support to primary challengers running for open seats.

“At this time I don’t have any plans to oppose any incumbent Republican,” Paul said.

The National Association for Gun Rights has targeted other Republican senators in the campaign to oppose expanded background checks, including Sen. Johnny IsaksonJohnny IsaksonSchumer to House GOP: 'Turn back before it's too late' Watchdog finds problems persist with veterans suicide hotline Underdog candidates try to stand out in high-profile GA special election MORE (Ga.) and Chuck GrassleyChuck GrassleyLive coverage: Day three of Supreme Court nominee hearing Live coverage: Day two of Supreme Court nominee hearing Grassley, CNN host spar over Trump wiretap claims MORE (Iowa).