Donald Trump is the only president in the history of polling never to have gained the support of a majority of Americans for even a single day.
This sort of presidency is only possible because of the Electoral College system.
Donald Trump deserves full credit for his firm grasp of the essential attribute of this system: it benefits a candidate nothing to do what most people want. All that matters is what turns out the plurality in a few states.
The problem for most Americans is the system. It is constructed so as to create an irresistible pull into the presidency of candidates who ignore the preferences of a majority of Americans.
If you don’t like this, don’t blame Trump. Change the system.