Bayer is making an aggressive new push to shrink one of the country’s most closely watched mass torts, asking the federal court overseeing Roundup litigation to dismantle nearly 4,000 pending cases after a recent U.S. Supreme Court ruling it says undermines plaintiffs’ core warning-based claims.

The motion targets the federal multidistrict litigation before Judge Vince Chhabria in the Northern District of California, where Roundup plaintiffs have long alleged that Monsanto failed to adequately warn users that the herbicide could cause cancer.