Carson to Critics: ‘Speculate All You Want’ on Reason for CNBC Debate Threat

“He was president, OK?" Trump said. "Blame him or don’t blame him, but he was president. The World Trade Center came down during his reign.”

A reporter summarized Trump’s comments, and Carson said, “I think he said it happened on his watch. Did he actually say he was blaming him for it? I didn’t hear the statement but I would be surprised if he blamed him for it, that wouldn’t make much sense, would it?”

The reporter said to Carson, “You don’t think George Bush has any responsibility for the attacks on 9/11?”

"I think it's ridiculous to suggest that he’s responsible for it," he responded.

Carson also explained how his experience on the board of directors at Costco and Kellogg has helped shape his economic policies.

“My time at both Kellogg and Costco obviously had me working very consistently with both national and international economic policies, understanding a lot about the economies in lots of different countries and also understanding the whole retail market and how capitalism works. You get a real inside deal on that and I think that’s an important thing to know,” he told PJ Media.