In October 2014, House Speaker Tim Jones announced plans to investigate charges that Koster took actions in office that were designed to benefit campaign contributors. News coverage revealed that The Simmons Firm had donated two $50,000 checks to Koster's campaign in 2013 only months after Koster filed a lawsuit against Republic Services over its underground fire at the Bridgeton Landfill (Simmons subsequently won a nearly $7 million settlement from Republic in a class-action lawsuit).; that Koster had ended an inquiry focusing on the company 5-hour Energy after conversations with a lobbyist for the company who was also a Koster contributor; and that Koster had negotiated an agreement with Pfizer, another campaign contributor, to pay Missouri $750,000 in connection with a multistate investigation of illegal marketing practices, about $350,000 less than what the state would have collected had it participated in a joint negotiation with other states, and attended a Pfizer convention as a speaker and guest during the settlement negotiation.