DETROIT -

The Reverend Jesse Jackson was in Detroit Friday calling for residents to hold a nonviolent protest against the appointment of Kevyn Orr as the city's Emergency Financial Manager.

READ: Detroit EFM protestors snarl traffic on I-94 near Lodge Freeway

Jackson was joined by Congressman John Conyers and Detroit Councilwoman JoAnn Watson.

They said they are planning to file a lawsuit challenging the constitutionality of Detroit's EFM law, which takes effect Thursday, early next week.

READ: Detroit City Council members clash at Tuesday night community meeting

The civil rights leader told the Associated Press that turnaround expert Kevyn Orr's appointment by the state is a "constitutional crisis" because it usurps local control.

Jackson said, "Detroit cannot be reduced to a rummage sale."

JoAnn Watson Detroit City Council Detroit’s Democratic Reps. John Conyers and Gary Peters are asking the General Accounting Office to investigate Michigan’s emergency manager law.  The congressmen made their request in a letter sent to the agency Thursday, one week after bankruptcy expert Kevyn Orr was appointed Detroit's emergency financial manager.

Conyers and Peters asked the office to "conduct a study of the Michigan emergency manager law, including the operation of federally funded programs." 

READ: Detroit emergency financial manager Kevyn Orr's back taxes still unpaid

In a statement, Conyers says it’s "difficult to identify a single instance where an emergency manager has succeeded in turning around the financial fortunes of a city or jurisdiction."

Emergency managers have wide-ranging authority to mend a city's budget.

Benton Harbor, Pontiac, Flint, Ecorse and Allen Park are other cities currently under state oversight.