He is about the most ardent of the neocons. According to Newt, the United States is in tremendous danger, and the only way we can avoid complete disaster is to attack, attack, attack.
He would be as much of a disaster as president as Giuliani would have been, from this perspective.
McCain is an uber-hawk, but at least he is not a good-vs-evil, high-threat-perception, world-transforming neocon.