Mitt Romney and Newt Gingrich blasted each other for attack ads being run by outside groups, with Romney calling the pro-Gingrich group's attacks "the biggest hoax since Bigfoot."

"Mr. Speaker, you have a super PAC ad that attacks me," Romney said after Gingrich complained about a pro-Romney group's attacks against him. "It's probably the biggest hoax since Bigfoot. The people who have looked at it have said this ad is entirely false."

Gingrich had started the fight when asked about a charge from a pro-Romney group run by his former advisors that said he had voted for foreign aid that helped China abort children.

"This is typical of what both Senator Santorum and I have complained about with Governor Romney’s super-PAC, over which he apparently has no influence — which makes you wonder how much influence he would have if he were president," he said, and called the bill "explicitly a falsehood."

Romney stopped short of a full disavowal of the ads, saying that "I can tell them as publicly as I can here that if there's anything that's inaccurate in any ads that support me, I hope they take it off an don't run it," before pivoting to his attack on Gingrich's outside group.

One thing the two agree on: That the laws barring unlimited donations to candidates while allowing them to outside groups not connected to the campaigns should be struck down, and unlimited donations to politicians should be allowed.

"We all would like to have super-PACs disappear, to tell you the truth," Romney said. "Wouldn't it be nice if people could give what they like to to campaigns and campaigns could run their own ads? I'd take responsibility for them." 

Romney then called current campaign finance laws "a disaster."

Gingrich has previously expressed strong support for that position, and is close friends with the head of Citizens United, the group which brough the lawsuit that created the current legal situation.