If President Donald Trump follows through on his threat to send National Guard troops to Chicago — over the objections of Gov. JB Pritzker and Mayor Brandon Johnson — then it would be unprecedented.

“In Illinois, we are not aware of the state’s National Guard forces ever being federalized for an in-state response without the Governor’s request and concurrence,” wrote Illinois National Guard public affairs officer Lt. Col. Bradford Leighton in an email to the Tribune.

Trump threatened in a tweet in January 2017 to “send in the Feds!” in response to violence in Chicago. Ultimately, he didn’t.

National Guard deployment moves ahead in Illinois after judge declines state’s suit to block Trump call-up

A review of the Tribune’s archives produced 18 events in which the governor activated

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