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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 PortmanRobert (Rob) Jones PortmanOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Reddit hires first lobbyists Senate panel approves bill compelling researchers to ‘hack’ DHS 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 IsaksonJohn (Johnny) Hardy IsaksonAmeriCorps hurricane heroes deserve a reward — don’t tax it Price’s job seen at risk after Trump slams private jet use Senate passes bipartisan Medicare reform bill MORE (Ga.) and Chuck GrassleyCharles (Chuck) Ernest GrassleyRepublicans jockey for position on immigration House clears bill to combat crimes against elderly Grassley: DACA deal wouldn't need border wall funding MORE (Iowa).