Lawyers from the New York firm Kleinberg Kaplan Wolff & Cohen have taken the lead in opposing an agreement between Purdue Pharma and the attorneys general of 15 states that would clear the way for a $4.5 billion settlement and resolve thousands of opioid cases across the United States.

Kleinberg Kaplan partners Matthew Gold and Robert Tuchman represented Washington state and Oregon in a bankruptcy court filing Monday, which objected to Purdue’s reorganization plan for offering the company’s owners, the Sackler family, “blanket” lifetime immunity from civil suit in exchange for the multi-billion-dollar payment and the release of tens of millions of documents.