Resignation of Zohran Mamdani's Appointee Over Past Controversial Posts

New York City: A senior figure appointed by Mayor-elect Zohran Mamdani has resigned following the re-emergence of old social media posts that contained antisemitic language. The formal acceptance of the resignation of Zohran Mamdani's appointee was announced on Thursday, December 19, 2025.

Catherine Almonte Da Costa, chosen to join Mamdani's forthcoming administration earlier this week, stepped down as her decade-old posts began circulating widely. The content, originating from 2011 and 2012, was brought to light by the Anti-Defamation League.

Controversial Posts Under Scrutiny

Mamdani's office noted that the posts included language reminiscent of damaging antisemitic stereotypes and caused offense within Jewish communities. This situation garnered prompt attention and intensified scrutiny on the mayor-elect's team.

In a public statement, Da Costa expressed heartfelt regret regarding her prior remarks. She emphasized that the comments do not reflect her current beliefs and recognized the pain they had caused.

“As the mother of Jewish children, I feel profound sadness and remorse for the hurt my words prompted,” she stated.

Position in the New Administration

Da Costa was designated to oversee Mamdani's Office of Appointments, a role pertinent to talent recruitment for the new administration. She previously gained experience in the mayor's office a decade ago and has held senior roles in a private communications firm and Sotheby's.

Despite her extensive professional background, the resurfacing of her posts culminated in the resignation of Zohran Mamdani's appointee, which was accepted immediately.

Mamdani Accepts the Resignation

Zohran Mamdani confirmed that he accepted Da Costa's resignation following her acknowledgment of the harm caused by her previous statements.

“She recognized the damage from her words and opted to resign. I respected her choice,” Mamdani stated through a spokesperson.

The Anti-Defamation League refrained from additional comments after the resignation but had earlier released screenshots of three posts it claimed propagated antisemitic themes.

Increased Political Scrutiny

Following Mamdani's election win in November, advocacy organizations indicated intentions to monitor his policies and staffing closely. This vigilance escalated due to Mamdani's outspoken criticisms of Israel's military strategies in Gaza.

Mamdani has faced repeated inquiries about whether his political stances verge on antisemitism. His campaign experienced backlash for not naming and condemning the phrase “globalize the intifada.” However, he has since expressed his disapproval of that phrase.

The resignation of Zohran Mamdani's appointee arrives as the mayor-elect anticipates taking office next month, assuring New Yorkers of an inclusive and respectful approach.

Critical Challenges Ahead for Mamdani

This incident underscores the hurdles Mamdani will face while assembling his leadership team amidst intense scrutiny from the public and the political sphere. The resignation ignites discussions surrounding accountability for past behavior online and expectations for public officials.

As Mamdani moves forward with his inauguration, the resignation of Zohran Mamdani's appointee will likely play a significant role in ongoing dialogues about leadership, accountability, and public trust.