New York City Mayor Zohran Mamdani is facing backlash after giving a ceremonial pen from a 9/11 remembrance ceremony to a top aide who once represented a convicted al Qaeda member whose brother-in-law hijacked the plane that struck the Pentagon.Mamdani signed executive orders Friday ahead of the 25th anniversary of the Sept. 11 attacks, designating the date a citywide day of remembrance and service and strengthening efforts to prevent future terrorist threats.After signing the final order, Mamdani handed the pen to NYPD Commissioner Jessica Tisch and asked her to pass it to chief counsel Ramzi...