Mitt Romney — not for the first time — has reversed field when it comes to Donald Trump. This time, his change of heart is a good thing. The former Massachusetts governor, now a first-term US senator from Utah, has emerged as the most prominent Congressional Republican to question Trump’s dealings with Ukraine, implicitly supporting an impeachment inquiry. Being Mitt, his comments have been carefully calibrated: he is “deeply troubled” rather than outraged; he has called on other members of his party to “search their hearts and do what’s right” rather than supporting a particular course of action. But even...
