California Attorney General Jerry Brown has threatened a prolific private toxic law litigator with “appropriate actions” if he doesn’t “change” his methods.

In a letter sent Friday, Brown asked Connecticut-based attorney Clifford Chanler to answer a series of questions about settlements his clients have entered into with retailers selling lead-laced glassware and ceramics. Brown said the amount Chanler charges in those settlements “seems unwarranted,” since the defendants rarely challenge the complaints Chanler brings under Proposition 65, California’s toxic protection law.