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People who know him say don't expect him to change. >> if general mcmaster not only understands his role but accepts his role as the lead to the national security council staff, and he also serves as the lead policy maker in essence for the white house and the administration, then he will have a chance to succeed. >> reporter: still, he may find his biggest challenge is dealing with steve bannon, the president's close political adviser who now has a seat on the national security council. >> if steve bannon understands his role as basically being the political adviser to the national security c...

Policy maker in essence for the white house and the administration, then he will have a chance to succeed. >> reporter: still, he may find his biggest challenge is dealing with steve bannon, the president's close political adviser who now has a seat on the national security council. >> if steve bannon understands his role as basically being the political adviser to the national security council and nothing more than that, then it has a chance to succeed as well. if mr. bannon goes beyond that, then it could very well not only interfere with the inner workings of the national security council b...