but complaining about tweets? let's take a little deeper with fox news contributor, senior editor at the federalist mollie hemingway and senior politics writer for u.s. news & world report david. david, i want to start with you because on the one hand there is a recent tradition -- george w. bush that i'm getting off the stage, i will not attack barack obama, but you go back in history, eisenhower, truman, they went after each other. there've been many examples. why won't barack obama leave the stage? >> i think first we have to be careful. he never even mentions donald trump. he's been very sparing in his criticisms. >> ed: david axelrod made it clear. >> we all know what he's talking about -- >> ed: why not deliver the punch? >> he's breaking presidents because trump is breaking president. president trump acting on social media is different than what we've ever seen, criticizing the fbi director, criticizing his own attorney general, criticizing hillary clinton