(Rex Features via AP Images) A fter the 2017 we had, it seems completely appropriate that as 2018 begins, we're arguing about whether Donald Trump is an idiot or a genius. Or perhaps "arguing" is the wrong word. It isn't like there's some kind of grand debate afoot, in which the two parties articulate opposing views, marshall evidence, and work to convince the public that their side is correct. You'd have a hard time finding a Republican not in Trump's direct employ who would say with a straight face that the president is an intelligent man, and with the release of Michael Wolff's book Fire and Fury: Inside the Trump White House , in which Wolff describes how the White House staff has to work to accommodate the fact that their boss is a simpleton, the president's insecurities have come bursting out yet again. Nobody's going to call him stupid without him hitting back! And so he has, announcing on Twitter that "Actually, throughout my life, my two greatest assets have been mental...