President Barack Obama, right, answers questions from Arizona Sheriff Paul Babeu, left standing, during a CNN televised town hall meeting at George Mason University in Fairfax, Va., Thursday, Jan. 7, 2016. Obama's proposals to tighten gun controls rules may not accomplish his goal of keeping guns out of the hands of would-be criminals and those who aren't legally allowed to buy a weapon. In short, that's because the conditions he is changing by executive action are murkier than he made them out to be.

FAIRFAX, Va. — President Barack Obama mocked conspiracy theorists and tore into the National Rifle Association for pushing “imaginary fiction,” as he described his plans to tighten gun control rules as modest first steps toward tackling gun violence in America.

In a prime-time, televised town hall meeting Thursday, Obama fielded tough questions from high-profile gun control opponents and supporters alike, often answering with sympathy and without confrontation as he tried to reassure Americans there is a middle ground on a fiercely divisive issue.

But Obama didn’t hold back when asked by CNN moderator Anderson Cooper about the notion that the federal government — and Obama in particular — wants to seize all firearms as a precursor to imposing martial law. He blamed that notion on the NRA and like-minded groups that convince its members that “somebody’s going to come grab your guns.”

“Yes, that is a conspiracy,” Obama said. “I’m only going to be here for another year. When would I have started on this enterprise?” Obama defended his support for the constitutional right to gun ownership while arguing it was consistent with his efforts to curb mass shootings. He said the NRA refused to acknowledge the government’s responsibility to make legal products safer, citing seat belts and childproof medicine bottles as examples.

Taking the stage at George Mason University, Obama accused the NRA of refusing to participate in the town hall despite having its headquarters nearby.

“Since this is a main reason they exist, you’d think that they’d be prepared to have a debate with the president,” Obama said.

NRA spokesman Andrew Arulanandam said beforehand the group saw “no reason to participate in a public relations spectacle orchestrated by the White House.” Several NRA members were in the audience for the event, which was organized and hosted by CNN. And the NRA pushed back on Twitter in real time, noting at one point “none of the president’s orders would have stopped any of the recent mass shootings.”