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Gingrich has criticized the pro-Romney super-PAC Restore Our Future for running negative ads against Gingrich, urging Romney to "disown" them and arguing that "the only person who profits from Republican ads attacking other Republicans is Barack ObamaBarack Hussein ObamaBiden: Democrats' spending plan is 'a bigger darn deal' than Obamacare Harris stumps for McAuliffe in Virginia Biden to stump with McAuliffe Tuesday MORE."

Romney responded that he is not allowed to help the super-PAC plan in any way. Campaign finance laws forbid coordination between campaigns and outside spending groups, a rule Gingrich brought up in his own defense when asked about the mail campaign at a press conference in Iowa on Wednesday.

"I don’t control them but I would discourage them from sending out that kind of negative information. That’s wrong," Gingrich said.