A day after the speaker signaled plans to pass the measure, Mayor Michael Bloomberg urged council members on Wednesday to oppose it. He says he'll veto it if they don't.
Hours later, Council Speaker Christine Quinn said she'll guarantee the council will override any veto.
Civil liberties advocates say the NYPD needs a new watchdog. They're troubled by its extensive use of the tactic known as stop and frisk and by its widespread spying on Muslims, detailed in stories by The Associated Press.
Bloomberg and police say they already get enough oversight from a civilian complaint board and other entities.