NEW YORK – A recent appointee of New York City’s Mayor-elect Zohran Mamdani has stepped down following the resurfacing of controversial social media posts from over ten years ago. The posts, which included antisemitic themes, prompted her resignation, as announced by Mamdani’s office on Thursday.

Catherine Almonte Da Costa, who was appointed this week to join the new administration, voiced her “deep regret” regarding the posts made in 2011 and 2012, which came to light again through the Anti-Defamation League’s online dissemination.

“These comments don’t reflect my true self. As a mother to Jewish children, I am deeply sorrowful and remorseful for any hurt these words may have caused,” Da Costa expressed in her statement.

Da Costa was initially chosen to spearhead Mamdani’s office of appointments, focusing on “talent recruitment strategy.” Her previous experience includes working in the office over a decade ago and holding positions at a private communications firm and Sotheby’s, according to the mayor-elect’s office.

A spokesperson for Mamdani confirmed that her resignation has been accepted.

“Catherine expressed her deep remorse over her past statements and tendered her resignation, and I accepted,” Mamdani said.

The Anti-Defamation League declined to comment after Da Costa’s resignation. The prominent Jewish advocacy organization had shared three tweets from Da Costa that it said “echo classic antisemitic tropes and otherwise demean Jewish people.”

Following Mamdani’s election in November, the group announced a new tool “to track and monitor policies and personnel” hired by Mamdani, who has been heavily critical of Israel.

Mamdani, who takes office next month, has been under intense pressure to show that his opposition of Israel’s military actions in Gaza do not amount to antisemitism. During his campaign, Mamdani drew criticism for refusing to condemn the phrase “globalize the intifada,” though he has more recently said he discourages people from using it.