The principle adopted at the height of the Islamist terrorism boom was "We don't negotiate with terrorists." The principle served us well.

We need a new principle to deal with existential threats to the constitutional order: You must indict. Trump is setting up the narrative that he has the strength to intimidate his political enemies. This bluff must be called. And the indictment must go big. No Al-Capone-tax-fraud-charges style of managing a problem. A trial must be about reasserting the ideals of how our self-governance is to operate.