Monsanto, the maker of the glyphosate-based herbicide Roundup, filed a motion June 16 in U.S. District Court, Northern District of California to reconsider the chemical’s addition to California’s Proposition 65 list of agents known to cause cancer.

The agrochemical giant made this move based on a June 14 Reuters investigation of Dr. Aaron Blair, a lead researcher on the World Health Organization’s International Agency for Research on Cancer (IARC) committee, that classified glyphosate as a “2A probable human carcinogen” in March 2015.

On June 22, Monsanto’s petition for review and application for stay were denied by the court.

Earlier this year, California became the first state to consider requiring Monsanto to label glyphosate as a chemical “known to the state to cause cancer” in accordance with the Safe Drinking Water and Toxic Enforcement Act of 1986, better known as Prop 65. The designation was compelled by the IARC’s glyphosate classification.

Glyphosate is at the center of hundreds of cancer lawsuits in which plaintiffs across the U.S. claim that they or their loved ones developed non-Hodgkin’s lymphoma due to exposure to Monsanto’s Roundup, pointing in part to the IARC cancer classification.

But the St. Louis-based agrochemical maker has vehemently defended the safety of its star product and has previously attempted to block the herbicide from California’s cancer list.