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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 PortmanSenators to Trump: Get tough on Russia over Ukraine John Glenn dies at 95 John Glenn hospitalized 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 IsaksonGOP senators wary of nuking filibuster SENATE: Republicans defy odds to keep majority A banner year for U.S. leadership on aid effectiveness MORE (Ga.) and Chuck GrassleyChuck GrassleyMnuchin, Price meet with GOP senators Business groups express support for Branstad nomination 10 no-brainer ways to cut healthcare costs without hurting quality MORE (Iowa).