Several leading community groups filed a class-action lawsuit against the city of Chicago Wednesday in a bid to bypass or even scuttle a draft agreement between the city and the U.S. Department of Justice that seeks to reform the nation's second largest police force without federal court oversight.

The more than 100-page lawsuit filed in U.S. District Court in Chicago argues that an overhaul of Chicago's 12,000-officer force in the wake of a damning civil rights report in January can't work without the intense scrutiny of a court-appointed monitor answerable to a judge.

"Absent federal court supervision, nothing will improve," the lawsuit says. "It is clear that federal court intervention is essential to end the historical and on-going pattern and practice of excessive force by police officers in Chicago."

While President Donald Trump's attorney general, Jeff Sessions, has expressed skepticism about court involvement, President Barack Obama's administration saw it as vital to successful reforms. Obama's Justice Department typically took a city reform plan to a judge to make it legally binding in the form of a consent decree.

Wednesday's lawsuit — which names Black Lives Matters Chicago among the plaintiffs — asks for a federal court to intervene and order sweeping reforms to end the "abusive policies and practices undergirding the alleged constitutional and state law violations."

Mayor Rahm Emanuel's administration said earlier this month that a draft deal negotiated by the city and the Justice Department — one that foresees a monitor not selected by a court — is being reviewed in Washington. Justice Department spokesman Devin O'Malle cautioned last week that "there is no agreement at this time."

A lead attorney in the new lawsuit, Craig Futterman, a University of Chicago law professor and outspoken advocate for far-reaching police reforms, said in a telephone interview that reports about the draft influenced the decision to sue now.