Just hours after the FBI raided both his home and the Sergeants Benevolent Association, the president of the union Ed Mullins announced his resignation from the position.

Mullins has been the president of the union since 2002 and has been with the NYPD since 1982. The union represents 13,000 active and retired NYPD sergeants.

FBI was seen carrying out boxes from his office in lower Manhattan. Mullins was seen leaving his home on Long Island hours after the FBI raid.

Mullins has clashed with Mayor Bill de Blasio in the past, and was accused of being responsible for releasing de Blasio’s daughter’s arrest papers. The mayor took to Twitter with his thoughts:

"This is someone who attempted consistently to divide this city who used language that was disrespectful and often created a divisive atmosphere," said de Blasio.

Mullins was also under fire for calling Rep. Ritchie Torres a “first class whore” last year.

The union’s board says while he is still presumed to be innocent, they did ask him to step aside and say they are cooperating with the investigation. The NYPD has told News 12 that as of now he is still an active member.

Mayor Bill de Blasio said he doesn't know what the arrest is for but that Mullins consistently worked to divide the city and used language that was disrespectful, often creating a divisive atmosphere.

NYPD Commissioner Dermot Shea said commenting on ongoing cases would be inappropriate for him. He added that the NYPD Internal Affairs Bureau and the FBI work jointly on a task force, and that as a result of that work "you saw some of the investigative powers being exercised yesterday."

"When those trials occur and when it comes to me I will make an ultimate decision at the end," Shea added.

An attorney for Mullins didn't return News 12's request for comment.