Never mind the long-standing convention that American presidents don’t meddle in foreign elections, Donald Trump simply could not resist. “Another terrorist attack in Paris,” he posted in a dawn tweet. “The people of France will not take much more of this. Will have a big effect on presidential election!” He may have been clever enough to avoid mentioning Marine LePen by name, but not so clever as to avoid accusations of interfering.
There are other conclusions to be drawn.