as president trump heads to nashville, he's taking an unexpected travel buddy with him. none other than tennessee senator bob corker, the same republican, yes, who labeled the white house an adult day care center and openly questioned the president's competence last year. >> the president has not yet -- has not yet been able to demonstrate the stability nor some of the competence that he needs to demonstrate in order to be successful. >> now, the president, not surprisingly, struck back on twitter calling him a lightweight, even mocking him as little bob corker who wouldn't be able to get elected dog catcher in tennessee. how did this all happen? ann guerin is "the washington post" white house correspondent. have the two put their spat behind them? >> well, at least on some matters they have.