it took some time for members of the GOP to realize that Nixon had gone off the rails...among their final realizations was Nixon's sheer abuse of power...many staunch supporters of Nixon's believed, and still believe, he was a good POTUS, but enough of them opened their eyes...
Trump's approval/popularity is only among the solid GOP and has hovered around 40% of all voters and 85% of the GOP, those who support him regardless of the number of out-right lies that he spews.....he has not gained much support from independents who seem to be wise to his fact challenged/outright false proclamations...
these same people mocked Obama, a Constitutional lawyer who had some understanding of where the lines were, for wanting to be King....and don't see that Trump, who doesn't seem to have read one line of the Constitution, has advanced much father down the stream of monarchical tendencies...