The charts above are from the Pew Research Center. They conducted a survey between February 4th and 15th of 6,395 adults (2,599 Republicans and 3,588 Democrats). The margin of error for adults is 1.6 points. For Republicans it is 2.3 points and for Democrats it is 2.2 points.
The Republicans see Trump as fighting for issues they believe in. But that doesn't mean they don't see some of his flaws. Only 31% of Republicans like the way he's conducted himself in office, and a whopping 73% say he is self-centered.
Those are flaws they would be quick to condemn in a Democrat, but they seem willing to overlook them in Trump.