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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 PortmanTax rules will be subject to more OMB review under new memo Ending sex trafficking tomorrow requires preventing child abuse today Doctors bristle at push for opioid prescription limits 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 IsaksonNow is the time to modernize the OTC monograph system Overnight Health Care: GOP pushes stiff work requirements for food stamps | Johnny Isakson opens up about family's tragic loss to opioids | Republicans refuse to back vulnerable Dem's opioids bill | Dems offer new public option plan The Hill's Morning Report: Haley clashes with White House MORE (Ga.) and Chuck GrassleyCharles (Chuck) Ernest GrassleyGrassley renews complaints about History Channel Republicans divided over legislation protecting Mueller The Hill's Morning Report: Inside the Comey memos MORE (Iowa).