President Donald Trump on Saturday posted what appeared to be an AI-created image of himself in front of the Chicago skyline with helicopters, flames and the phrase “Chipocalypse Now.”

Chicago officials are sounding the alarm on Trump’s social media threat declaring “war” on their city.

“The President of the United States is threatening to go to war with an American city,” Mr. Pritzker wrote. “This is not a joke. This is not normal.”