Trump is many things (an idiot, a moron, and grossly incompetent) and probably will be forced to resign or lose the 2020 elections. Or simply not run again.
But he is the legitimate President of the United States. Really wish the Left would stop this "delegitimization" campaign. How well did it work out against W? All it did for W's voters was to make them think they were fighting the Left, not sustaining a President who most people agreed wasn't that great in hindsight. (Not that I agree; I liked W.)
Lewis should focus on positing Trump as a terrible President, not questioning the legitimacy of the victory. The victory was clear and Trump played by the rules and won.
Although it had many bumps, it eventually worked pretty well for Republicans to do it to Obama...