The rumor emerged amid ongoing calls from certain 9/11 victim advocacy families to exclude Zohran Mamdani from the upcoming 25th-anniversary memorials.
NEW YORK CITY, NEW YORK: A rumor has been making the rounds on social media alleging that former New York City Mayor Rudy Giuliani stated current NYC Mayor Zohran Mamdani is facing a formal investigation over alleged connections to extremist organizations and foreign governments. Because this assertion has generated widespread confusion and debate, it requires clarification.
Claim: Zohran Mamdani under investigation for connections to extremism and foreign entities

According to the viral posts, Giuliani publicly revealed that Mamdani is currently the subject of an official probe regarding ties to foreign governments and extremist factions.
The narrative has gained traction across digital networks such as X (formerly Twitter), Facebook, and Instagram, accumulating hundreds of thousands of views since earlier this month.
This has sparked intense online polarization. While numerous users accepted the rumor at face value and demanded the deportation or denaturalization of Mamdani and his spouse, others questioned its validity and pushed for a formal verification of the facts.
Fact Check: Rudy Giuliani made no such statement

Ultimately, the claim is entirely unfounded; there are no active or recent investigations into the Social Democrat mayor.
Furthermore, no evidence exists showing that the former Republican mayor made these remarks. A review of public records reveals no official statements, press releases, or social media posts from Giuliani supporting this narrative.
A broader search across Google and mainstream news organizations returned zero credible reports. An announcement of this magnitude would undoubtedly make national headlines and provoke widespread public reaction.
An automated analysis by Grok concluded, “The claim shared in the post is misleading. There is no confirmed announcement by Rudy Giuliani that NYC Mayor Zohran Mamdani is officially under investigation for ties to extremist groups and foreign governments.”
Certain 9/11 victim families push to bar Zohran Mamdani from the 25th-anniversary observance

The spread of this misinformation coincides with a separate, ongoing push by a faction of 9/11 victims’ relatives aiming to block Mamdani from attending the city’s upcoming 25th-anniversary memorial events next month.
When questioned by a reporter about these efforts to keep him away from the ceremonies, Mamdani responded, “I wonder how you feel about the fact that they’re trying to keep you away.”
“I will proudly honor the families, the survivors, the first responders, forever impacted by that horrific attack by standing alongside them at this year’s 9/11 commemoration, reaffirming that we will never forget the solemn day felt by all of us who call this city home and, frankly, by all of us who call this country home,” he stated.