Republican voters

A constant theme of media criticism of Donald Trump is that his approval rating (currently 42% according to Gallup) at this stage in his Presidency is the lowest amongst US Presidents.
This is to repeat a mistake made during the Presidential election.  It is a mistake to think of Donald Trump as an unpopular President, just as it was a mistake to think of him as an unpopular candidate for the Presidency during the election.  A far more correct way of describing him is as a deeply polarising President, just as during the election he was a deeply polarising candidate.