A former GOP strategist believes Republican presidential nominee Donald Trump is approaching an upcoming debate with Kamala Harris in such a way that it’ll be a “disaster for him.” Stuart Stevens told CNN panelists Monday night on “NewsNight” that not only is Trump’s head in the wrong place — “his campaign knows it.” “He doesn’t respect the vice president,” Stevens said. “And that’s going to come across.” Want more breaking political news? Click for the latest headlines at Raw Story. Trump’s endless stream of attacks on Harris include calling her “dumb” and a “socialist lunatic.” ALSO READ: Do…