Grandpa Marx isn’t just wacky when it comes to economics. He’s also a little kooky about guns, which is ironic because liberals think of him as a heretic on the issue.

Vermont Sen. Bernie Sanders says call 911 if you see anybody bringing guns and ammo into their residence.

That was Sanders’ response to ABC News debate moderator David Muir Saturday night, who asked him about the neighbors of the San Bernardino terrorists who suspected something was amiss about the would-be mass shooters but never reported them for fear of accusations of profiling.

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“That’s kind of a no-brainer. If somebody is loading guns and ammunition into a house, I think it’s a good idea to call 911. Do it,” Sanders said.