A federal judge overseeing nearly 2,000 lawsuits brought over the opioid crisis called a potential settlement proposal introduced by plaintiffs attorneys a “novel idea,” but held off ruling on the motion to allow time for objections.

U.S. District Judge Dan Polster of the Northern District of Ohio had planned to hear arguments on Tuesday about a motion for certification of a “negotiation class” that lead plaintiffs lawyers in the multidistrict litigation had filed earlier this month. But, on Monday, several opioid distributors and pharmacies named as defendants in the cases filed court documents opposing the idea. Attorneys general from 30 states, the U.S. territory of Guam and Washington, D.C., whose cases aren’t part of the multidistrict litigation, also filed letters Monday urging Polster to reject what they called a “novel and untested approach” to settlement.