We’ve heard the president of the United States denigrate and demean Chicago before.

What we haven’t seen until now is Donald Trump appearing before a gathering of the nation’s military commanders — summoned to Quantico, Virginia, from all over the globe for what turned out to be a bizarre made-for-TV rally of sorts — and describing our fellow citizens as “the enemy within” and adding our city to his list of potential “training grounds” for troops who enlist to defend America from foreign adversaries.

Trump speaks illiberally as a matter of habit. It’s sad to say that many Americans, whether supporters or opponents, at this point are inured to the schoolyard taunts and cartoonish bravado from our nation’s commander in chief.

But context in this case makes all the difference. It made th

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