When Trump promised to build the wall, he was demonstrating that he wasn’t beholden to the somewhat centrist immigration-reform tendencies of the rest of the Republican Party and didn’t care about political correctness. Once Trump was president, only a small portion of the wall got built, and Mexico didn’t pay for it as Trump had promised. Grievance is not a new note at Trump rallies, but four and eight years ago, he used to talk about other people’s grievances and promise to redress them.