A standard theme in detective thrillers is that the perpetrator feels compelled to return to the scene of the crime. It’s an irrational urge, and readers of such potboilers are often left wondering whether the protagonist secretly wants to get caught.

Perhaps we’re living a real-life version of this fictional plot in President Trump’s alleged solicitation of political help from Ukraine, which this week spawned a full-blown impeachment probe. Republicans question whether the Ukraine events have the weight of “high crimes and misdemeanors.” But when seen as part of a pattern of behavior, the gravity becomes clearer.

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