Republicans have nominated Donald Trump for the presidency twice before. But the third time will be different. The Republican National Convention that begins Monday in Milwaukee marks the first time Trump comes into a summer convention with the GOP in crisp lockstep behind him and Democrats reeling. In 2016 and 2020, he was the underdog, and he faced persistent skeptics even among Republicans. Some of those dissidents remain. But they won’t be inside the arena in Milwaukee. Delegates will hear from Trump and ratify the GOP platform that he approved. They’ll be introduced to Trump’s vice presidential running mate. And, of course, they’ll hear plenty of speakers mock President Joe Biden as a failure.