SD, PC is about sanctioning those who do not follow the party line, the correct line.  An executive order by Trump to end PC would assert that the first amendment reigns supreme and that no sanctions or punishment other than personal action shall be directed against the exercise of free speech.  For example, today a teacher says the N- word.  Today the teacher would likely be fired.  Under a Trump executive order to end PC no organizational, institutional, or governmental sanction may be applied to this teacher assuming the only offense of the teacher was saying non-PC things.  Now, individuals would be free to tell the teacher what they think of his comments and to personally avoid the teacher.  But official sanction for thinking differently is forbidden.  That is a very different world than the one of today where the free speech content of the first amendment is ignored if enough people don't like the speech.  Also, words are intrinsically neutral.  It is people who interpret.