A top aide to powerful national teachers’ union president Randi Weingarten claimed Zohran Mamdani lacks the experience to lead New York City — and cited the unpopularity of far-left Chicago Mayor Brandon Johnson as a cautionary tale, according to a bombshell email.

Leo Casey, an assistant to Weingarten at the American Federation of Teachers, sent the revealing missive to a Democratic Socialists of America group in May, according to emails leaked by school choice advocate Corey DeAngelis, who first reported the exchange.

“A lot of our discussion here is on blocking [ex-Gov. Andrew] Cuomo and winning the election, which is important,” Casey said in an email on a DSA list serve on May 20, just a month before the June 24 Democratic primary won by Mamdani. 6

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“But the ability to

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