US President Donald Trump has threatened to send troops to Chicago to “straighten that one out.” New York City, he says, might be next.

Already, armed National Guard regiments are patrolling the streets of Washington, DC. All this on top of the deployment of troops to Los Angeles earlier in the summer.

The deployment of out-of-state troops to occupy cities cannot plausibly promote public order. It’s blunt force, a brutal power grab. It runs afoul of the Constitution and the proper role for states.

I write history books and consider myself an expert on the presidency. I can think of few analogies—not in this country, anyway—for such a move by a chief executive.

Why is this particular turn so alarming? After all, public safety is important, and fighting crime is a worthy goal. My colleague Liza Goitein explains the legal and constitutional issues:

Public safety matters greatly. But facts belie the (ever shifting) rationale. New York, for example, remains one of the nation’s safest large cities. As Police Commissioner Jessica Tisch told Attorney General Pam Bondi yesterday, crime has dropped dramatically, even this........

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