Oh, please, oh please Should Donald Trump actually show up for the scheduled June 27 presidential debate, he may find the rules irritatingly confining. There will be no opening statements. Both Trump and Joe Biden wil have two minutes to answer questions before moderators cut their mics. Red lights will flash when they have five seconds left. Trump will have little time to ramble on about windmills, electric boats and baby sharks doo doo doo doo doo doo. Commercial breaks will give both men a breather, the New York Times reports, but they will be prohibited from huddling with advisers. Not that Trump would, although he proved (when under threat of a contempt charge in a New York court) that his attorneys could contain him, barely. But Judge Juan Merchan will not be moderating for CNN: The two men are readying themselves for the debate in ways almost as different as their approaches to the presidency itself. The Biden operation is blocking off much of the final week before the debate, after he returns from Europe and a California fund-raising swing, for structured preparations. Mr. Trump has long preferred looser conversations, batting around themes, ideas and one-liners more informally among advisers. He held one session at the Republican National Committee headquarters this past week. Mr. Trump and Mr. Biden plainly do not like each other. The former president calls the current president the worst in American history. The current president calls his predecessor a wannabe dictator who threatens democracy itself. Four years ago, in…