Mullins has previously been accused of violating policy when he posted the police report from New York City Mayor Bill de Blasio's daughter's arrest during the George Floyd protests last year. He is currently facing a departmental trial over the accusation.
"Ed Mullins dishonored his uniform, his city and his union more times than I can count. It was just a matter of time before his endless hatred would catch up with him. That day has come," de Blasio tweeted late Tuesday following news of Mullins' resignation.
Congressman Ritchie Torres also commented on Mullins' resignation.
"A first-class raid followed by a first-class resignation. Former Sergeant Ed Mullins: Don't let the door hit you on the way out," he tweeted.