Days before a critical Indiana primary that could sew up the presidential nomination for the “presumptive” Republican party nominee, the candidate’s eldest son, who is also his current campaign surrogate and Executive Vice President of the Trump Organization, isn’t interested in talking politics at all..... If all of these Trump business traits—passion, hard work, getting your hands dirty—sound distinctly similar to many of the themes Donald Sr. is hammering home on the Republican campaign trail it’s because they’ve run in the family for decades—and Don Jr. isn’t shy about telling voters as much. Presidential campaigns have a habit of throwing...