The GOP mayor of Arizona’s third-largest city is calling on his fellow Republicans to break with former President Donald Trump, saying in an interview he “lacks the commitment to the rule of law and to the United States’ Constitution to qualify as an elected official.” Mesa Mayor John Giles endorsed Vice President Kamala Harris in an op-ed calling for “leaders who will put country over party.” Giles had more to say on MSNBC: “As a Republican I love to endorse Republicans and so this was a pretty thoughtful process and also being a mayor, my preference is to avoid getting involved in public par…