Republicans on Tuesday made clear how they’re running against Vice President Kamala Harris, and it involves calling her the “border czar.” A lot. A range of speakers on the second day of the Republican National Convention went after Harris, who some Democrats argue is the party’s best option if President Joe Biden drops out of the 2024 race. She was also Biden’s appointed lead working with Central America to deter migration at the southern border, prompting Republicans’ “border czar”...