"I would ask certain questions ..." he said. "It's not a litmus test. It's making sure we have people committed to the constitution first in order for them to work effectively in the administration."
His words drew a pointed rebuttal from Romney, who bluntly said the threat from "Sharia law" that Cain and other GOP candidates have played up is exaggerated. He added that he would freely appoint Americans of any religion.
"First of all, of course, we're not going to have Sharia law," Romney said. "That's not going to happen. We have a constitution and we follow the law. No, I think we recognize that the people of all faiths are welcome in this country, our nation was founded on a principal of religious tolerance. That's in fact why some of the early patriots came to this country and we treat people with respect...with their religious persuasion."