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Democratic presidential front-runner Hillary Clinton unveiled a sweeping gun control proposal Monday that included closing the "gun show loophole" and allowing victims of gun violence to sue firearm manufacturers.

Under the plan, which comes in the wake of a mass shooting at an Oregon community college that left 10 people dead last week, Clinton would tighten rules governing gun show and Internet sales using executive action "if Congress will not act," aides said.

"When this happens, people are quick to say that they offer their thoughts and prayers, that's not enough," Clinton said. "How many people have to die before we actually act, before we come together as a nation?"

Clinton's plan addresses the so-called gun show loophole, under which private gun sellers aren't required to perform background checks of buyers.

She would also push to repeal a law backed by the National Rifle Association that prevents crime victims from suing gun manufacturers. And her proposal would revoke the licenses of "bad actor" dealers who knowingly supply guns to straw purchasers and traffickers.