A North Carolina Republican Senate candidate who has been endorsed by Sen. Rand Paul (R-KY) refused to say whether the Sept. 11 attacks on the World Trade Center were an inside job and instead said only that “things like this have to be asked.”

The candidate is Dr. Greg Brannon, one of a handful of Republicans in the primary to defeat Sen. Kay Hagan (D-NC). Brannon made the comments when he was a guest on a local radio talk show hosted by Bill LuMaye. The exchange, between Brannon and a caller, was highlighted by Mother Jones on Monday. Here’s the exchange:

LuMaye: Well, I’d rather not get into a discussion on whether 9/11 was an inside job or not. I really, I mean, we can save that for another day, I have no problem with that, it’s just—

Greg Brannon: These questions, again, actually, that’s what [9/11 commission vice-chair] Lee Hamilton said. And he just said, there’s other questions that need answering. The guy who got all the information…a Democrat and a Republican, were the co-chairmen of the 9/11 commission, and when they got done, they did not put their stamp of approval on the commission. They said, there’s data that we did not put in there. So things like this have to be asked.

Brannon has a history of making bizarre and outlandish comments, causing national Republicans to worry that he could be a liability if he won the nomination. For instance, Brannon, a former OB/GYN, once said that Planned Parenthood had a secret plan to kill newborn infants. He has also compared food stamps to slavery and reportedly helped sponsor at an event that supported nullification.