Both Trump and Cruz argue whenever possible that they are engaged in a battle against “political correctness.” Their ostensible point is that the nation cannot hope to win a battle against its enemies if it is ideologically indisposed to even name them correctly.
The voters, of course, understand perfectly that Trump and Cruz are really saying that their perceived domestic foes–African-Americans, Hispanics, uppity women, Muslims, gays, et. al.–are eroding traditional forms of authority and need to be put in their place. The paradox is that even Trump and Cruz are afraid to put the issue in such bald terms for fear of creating a backlash, so they frame the battle much more obliquely. The battle against PC, therefore, is itself PC.