Baker & McKenzie has turned to Williams & Connolly to defend the firm against claims that its Brazilian affiliate’s hiring of a former government prosecutor jeopardized a client’s $3.18 billion settlement from that country’s “Operation Carwash” corruption scandal.

An investment entity that is parent to Brazil’s largest producer of meat and poultry and is controlled by two billionaire brothers said in an April lawsuit that Baker & McKenzie’s Brazilian affiliate, Trench Rossi e Watanabe Advogados, hired a government prosecutor as a partner while both firms were helping the investment company fight off government probes in Brazil and the United States.