A slate of challengers is working to unseat longtime New York police union leader Patrick Lynch amid a rancorous public battle with the mayor.

The group is led by the Brooklyn South trustee at the Patrolmen’s Benevolent Association.

Brian Fusco said Tuesday that union leaders have been “grandstanding” instead of improving officers’ “disgraceful and dangerous” work environment.

Lynch is seeking a fifth term as head of the union, which represents 24,000 officers. He had no immediate comment.

Lynch is usually outspoken. The rhetoric has been ramped up since the Dec. 3 grand jury decision not to indict a police officer in the death of Eric Garner.

Lynch said Mayor Bill de Blasio had “blood on his hands” after two officers were shot to death.

(AP)