A bipartisan group of Massachusetts mayors are opposed to Question 1 on the November ballot.
They say they have to step in to save their hospitals.
Passage would require hospitals statewide to adhere to nurse staffing levels at all times.
The mayors say the mandate's lack of flexibility by holding small rural and community hospitals to the same staffing levels as the big Boston teaching hospitals is a major concern.
They warn the high costs associated with Question 1 would force some vulnerable hospitals to close.
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