Donald Trump took to insulting Detroit…in Detroit. Detroit Free Press

Donald Trump loves a good roast.

He bestows nicknames on his political opponents. Sleepy Joe Biden. Ron DeSanctimonious.

He performs brief imitations of Kamala Harris and others onstage in the middle of stump speeches.

He sat through his own roast on Comedy Central back in 2011. And just this week, he appeared on the comedy podcast “Flagrant,” appearing to feel right at home surrounded by a group of men who make fun of each other for a living.

It may be the key to his baffling popularity.

So it was no surprise Thursday when he called Michigan’s political leaders “stupid,” popular union boss Shawn Fain a “disaster,” Harris a “lunatic” and the U.S. itself “the dumb country" during a speech at a Detroit Economic Club meeting held at Detroit's Motor City Casino.

Khalil AlHajal, Detroit Free Press