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Mr. Brophy said he sees a switch from the arguments made by gun control advocates and Democrats during the 2013 legislative session, when they insisted that the legislation was needed to prevent mass shootings.

“The justification for bringing these [bills] up was Newtown, Columbine, Aurora,” said Mr. Brophy. “If they’re admitting that the purpose of these bills was not to stop these crimes from happening in the future, it makes me think the real reason for running these bills was to disarm everyone.”

The National Rifle Association, in its response to the deadly Newtown, Conn., elementary school shooting in December 2012, proposed a National School Shield Emergency Response Program in which qualified police, military, security personnel and others would organize to protect schools.

In a statement widely criticized by gun control groups, NRA Executive Vice President Wayne LaPierre said at a news conference a week after the Newtown tragedy, “The only thing that stops a bad guy with a gun is a good guy with a gun.”

The new Colorado laws mandated background checks for all sales and transfers, including temporary transfers; required gun buyers to pay for their background checks; and limited ammunition-magazine capacity to 15 rounds or fewer. None of those provisions stopped the Arapahoe gunman, who had no criminal record and purchased buckshot, steel-shot and slugs instead of ammunition magazines.

The gun control bills triggered a populist backlash that resulted in the recalls of two Democrats from the state Senate, the first legislative recalls in Colorado history. A third state senator resigned Nov. 27 before recall petitions were submitted.

Republican legislators want the measures repealed next year, but Mr. Hickenlooper said in a Tuesday interview with Colorado Public Radio that he doesn’t see that happening. Despite the recalls, Democrats continue to control both houses of the General Assembly.

“If someone comes and has some way of changing or proving or getting rid of something that’s wrong in universal background checks, I’m not ruling anything out. Let’s see what people want to bring forward,” said Mr. Hickenlooper. “[But] I don’t think we’re going to repeal anything.”