The guy who has actually hired illegals, once he decides to run for president, now uses “build the wall” as an applause line in his speeches. He’s adopted a position that many other conservatives in the race have held for many years. In other words, tRump wasn’t the first to take that position, but he co-opted it. Pretty simple, really. Maybe that’s the problem, it’s too simple.
Cruz didn’t until November, once Trump made it popular.