India, Dec. 19 -- Catherine Almonte Da Costa resigned Thursday from her newly announced role in Mayor-elect Zohran Mamdani's administration after her past social media posts containing antisemitic language resurfaced, triggering swift backlash.

Da Costa had been named just a day earlier as Mamdani's incoming director of appointments. Her resignation came hours after the Anti-Defamation League of New York and New Jersey publicly questioned whether Mamdani's team was aware of offensive posts she had made on X, formerly Twitter, more than a decade ago.

Those posts, dating back to 2011 and 2012, included explicit antisemitic stereotypes. In one January 2011 tweet, Da Costa wrote, "Money hungry Jews smh." Later that year, she posted, "Woo! P...