“I think it is legitimate to say how many police, how many federal agents, were on the planes that hit the Twin Towers. Maybe the answer is zero. It probably is zero for all I know, right? I have no reason to think it was anything other than zero. But if we’re doing a comprehensive assessment of what happened on 9/11, we have a 9/11 commission, absolutely [that] should be an answer the public knows the answer to.”