. >> a new book by bob woodard is outlining deep divisions in the white house over the war in afghanistan, with advisers arguing over the war and some doubti ining if the president's strategy will work. chuck todd joins us. so, chuck, reportedly some big disagreements we're talking about. >> reporter: that's right, tamron. we're hearing about disagreements, particularly from the diplomatic side and the military side of the presidential -- of the president's advisers. now, the white house is already reacting to the book this morning. senior administration official putting out a fairly lengthy memo about the book saying, look, these policy divisions were well known at the time. this is the way the president operates. he wants different point of views. he wants a lot of information before he comes to a situation. so in many ways, they're trying to downplay these divisions and saying, hey, nothing to see here, tamron. we shall see if there's personnel recriminations, though, down the road. >> meantime, chuck, another economic adviser is leaving. >> reporter: that's right. larry summers, chair