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CHICAGO (AP) — The University of Illinois Board of Trustees are suing to try to stop nurses at the University of Illinois Hospital from striking this weekend.

The lawsuit filed Tuesday in Cook County Circuit Court names the Illinois Nurses Association as a defendant and seeks a temporary restraining order against the job action, saying it would pose a danger to the public.

Nurses at the hospital have announced they will begin a seven-day strike at 7 a.m. Saturday after contract negotiations broke down with the hospital over the number of patients under the care of each nurse.