of what matters most about how he's remembered for the fight against isis and his legacy in general? >> i think -- he's clearly somebody who thinks about this very deeply. how would history remember him? what are the most important things he did? he said during the campaign in 2008, ronald reagan was one of the most important presidents of his lifetime because he fundamentally changed the trajectory of a america in a way that richard nixon did not and bill clinton did not. so his aspiration was to be a transformational president. so he focuses in on the big picture, on the big bets he was able to make on health care, on energy policy. one of the things i was struck by is when you ask him where he thinks his legacy was most important, it is not combatting climate change or transforming energy's profile. so now we are a green superpower. we have this incredible solar