Romney is machine gun-toting 'Rombo' in new Santorum ad

Republican presidential candidate Rick Santorum has released a new ad warning voters to expect an onslaught of attack ads from former Massachusetts Gov. Mitt Romney.

In the new commercial, a Romney look-alike uses an assault rifle to fire mud at Santorum.

"Mitt Romney's negative attack machine is back on full throttle," the narrators says. "Romney and his super PAC have spent a staggering $20 million attacking fellow Republicans. Why? Because Romney's trying to hide from his big-government Romneycare, and his support for cap and trade."

The ad, titled "Rombo" after the "Rambo" movie character, goes on to show the weapon backfiring mud onto Romney.

In Florida alone, the former Massachusetts governor and super PACs supporting him spent nearly $16 million to destroy former House Speaker Newt Gingrich's chances in the state. Santorum is bracing for the same type of assault in upcoming primary states like Michigan, Arizona and Ohio.

Appearing on Fox News Wednesday, Romney laughed off the accusations in the ad.

"That’s the nature of politics which is that you always accuse the other guy of what you’ve done yourself," he chuckled. “My campaign hasn’t run any negative ads against Rick Santorum. His campaign ran attack ads against me in South Carolina and his PAC did so in Missouri.”

“So, I’ not saying we won’t finally go after the guy, but frankly, he’s been going to go after me, as that ad suggests.”

As for the actor portraying him, Romney asked, “The guy looked pretty good, didn’t he?”

Watch this video from Rick Santorum, uploaded Feb. 14, 2012.