The latest revelations in the Russia saga should refocus our attention on a critical period during the 2016 presidential campaign. I’m talking about the seven weeks or so that began in June 2016, when Donald Trump Jr. planned the infamous Trump Tower meeting with Russians, and ended in late July, with GOP presidential nominee Donald Trump publicly calling on Russia to hack Hillary Clinton’s emails. What we now know is this. During much of that period, the Trump Organization was secretly pursuing a business deal in Russia that required Kremlin approval — even though the most senior members of Trump’s...