By Geneva Sands - 11/18/11 08:45 PM EST
Cain's campaign has been mired in controversy since reports of sexual harassment allegations against him surfaced late last month.
Cain has said repeatedly that he has never acted inappropriately toward anyone.
His wife, Gloria Cain, defended her husband earlier this week against sexual harassment allegations made by former employees in her first televised interview.
"I'm thinking he would have to have a split personality to do the things that were said," Gloria Cain said according to media reports in an interview which will air Monday on Fox News' "On the Record."