NRA executive vice president Wayne LaPierre has told a news conference that "now is the time to speak about protecting American children.
Speaking for the first time since the Sandy Hook school shootings, he told reporters federal gun prosecutions have decreased and the media promotes violence through video games, adding that the media also demonises lawful gun owners.
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Labour have lost the Copeland by-election, a seat they had held since 1983, as the Conservatives edged the vote by 2,000 votes.
Labour have held onto the crucial seat of Stoke-on-Trent, brushing aside UKIP leader Paul Nuttall in the process.
A highly toxic chemical was used in the death of North Korean leader Kim Jong-un's half brother last week, tests have shown.