The John Jay College professor and anti-fascist activist whose tweet about teaching "future dead cops" sparked an uproar from law enforcement has now set his eyes on Mayor Bill de Blasio. Michael Isaacson accused the mayor of "mess[ing] up big" by "tak[ing] a swipe" at the school's autonomy and "free speech and academic freedom."

In late August, Isaacson tweeted, "Some of y'all might think it sucks being an anti-fascist teaching at John Jay College but I think it's a privilege to teach future dead cops." The tweet remained under the radar until Isaacson appeared on Tucker Carlson's Fox News shows to talk about the antifa movement on Thursday. According to the Daily News, "The tweet caught the attention of police union officials after the 29-year-old anti-fascist leader appeared on Fox News... Three union bosses and Police Commissioner James O’Neill slammed Isaacson’s tweet."

Isaacon was suspended and, on Friday night, de Blasio Tweeted, "New York City won't stand for the vile anti-police rhetoric of Michael Isaacson and neither should John Jay College"—which the professor responded to on Saturday.

Isaacson told the NY Post that he left the city after receiving many threats (many of which he shared on Twitter), "I was not really considering that people would take this seriously." He aded, "The content of the tweet is a fact, because I teach police and everybody dies, including police."

He did find some levity about it: