Texas plaintiffs attorney Mikal Watts is asking for at least $150 million in legal fees from the $1.5 billion settlement with Syngenta AG, citing his firm’s “unique position in this litigation.”

The Watts Guerra attorney’s fee request, filed last month but updated on Aug. 3, sets up a potential clash over what could be an estimated $500 million in fees in the class action settlement, which resolves claims by more than 600,000 farmers who alleged Syngenta sold genetically modified corn seed that China refused to import, causing farmers to lose billions of dollars. In a separate request for fees, lead counsel in the federal multidistrict litigation in Kansas are seeking that amount—about 33 percent of the total settlement fund.