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The National Rifle Association said it's "shameful" that President Obama would blame the group for this week's mass shooting in California.

"The National Rifle Association is not to blame. Neither is our Second Amendment freedom. An act of evil unfolded in California. President Obama used it not as a moment to inform or calm the American people; rather, he exploited it to push his gun control agenda," Chris Cox, executive director of the NRA's Institute for Legislative Action, wrote in an op-ed published in USA Today.

"The NRA is calling on the president to stop exploiting tragedies to push his failed political agenda," he wrote. "It's shameful. Given the reality that he's unlikely to listen, however, we will continue to stand and fight for law-abiding gun owners who are both disgusted and heartbroken by these heinous acts — whether committed by madmen, gang members or terrorists."

"The NRA will neither accept the blame for the acts of murderers, nor apologize for fighting for our right to defend ourselves against them," he said.

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