.President Donald Trump declared this week that Chicago Mayor Brandon Johnson and Illinois Gov. JB Pritzker “should be in jail” as tensions grow over his deployment of National Guard troops to the Land of Lincoln.

Even for a leader fixated on punishing his political enemies, Trump’s suggestion that two Democratic elected officials ought to be locked up marked a sharp escalation.

It’s yet another reminder that quaint notions of reaching across the aisle appear to have limited space in politics today. Trump’s sprawling retribution campaign has already ensnared another perceived enemy: former FBI Director James B. Comey, whose indictment last month was lauded by the president.

Of course, demonizing the opposition has a long history in American politics, from Hillary Clinton saying that h

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