Monsanto Co. and officials within the Environmental Protection Agency are fighting legal efforts aimed at exploring Monsanto's influence over regulatory assessments of the key chemical in the company's Roundup herbicide, new federal court filings show. The revelations are contained in a series of filings made ... as part of litigation brought by more than 50 people suing Monsanto. The plaintiffs claim they or their loved ones developed non-Hodgkin lymphoma (NHL) after exposure to Roundup herbicide, and that Monsanto has spent decades covering up cancer risks linked to the chemical. Lawyers for the plaintiffs want the court to lift a seal on documents that detail Monsanto's interactions with former top EPA brass Jess Rowland regarding the EPA's safety assessment of glyphosate, which is the key ingredient in Roundup. They also want to depose Rowland. But Monsanto and the EPA object to the requests. The World Health Organization's International Agency for Research on Cancer (IARC) declared in March 2015 that glyphosate is a probable human carcinogen, with a positive association found between glyphosate and NHL. Monsanto has been fighting to refute that classification. Rowland has been key in Monsanto's efforts to rebut the IARC finding. He chaired the EPA's Cancer Assessment Review Committee (CARC) that issued an internal report in October 2015 contracting IARC's findings. That 87-page report, signed by Rowland, determined that glyphosate was "not likely to be carcinogenic to humans."