Republican presidential candidate Herman Cain said Sunday that he didn't agree with abortion "under any circumstance."

The candidate, who has promised to work to overturn Roe v. Wade, told NBC's David Gregory that he believes in "life from conception."

"I do not agree with abortion under any circumstance," he insisted.

"Exceptions for rape and incest?" Gregory asked.

"Not for rape and incest," Cain replied. "Because if you look at rape and incest, the percentage of those instances is so miniscule that there are other options."

But when it came to cases where the life of the mother was at stake, the former Godfather's Pizza CEO left a little wiggle room.

"If it's the life of the mother, that family is going to have to make that decision."