One of Zohran Mamdani’s appointees resigned after antisemitic social media posts from 2011 and 2012 resurfaced, following her appointment this week to lead his office of appointments.Catherine Almonte Da Costa apologized, Mamdani accepted her resignation, and the episode has intensified scrutiny of the transition team’s vetting and raised concerns among Jewish leaders and lawmakers such as Hakeem Jeffries as Mamdani prepares to take office next month.