 Insurance brokers Aon plc NYSE: AON and Willis Towers Watson plc NASDAQ: WLTW have scrapped their proposed 30 billion merger following a lawsuit by the U.S. Department of Justice agreement to block the transaction. What Happened: In a press statement, Aon CEO Greg Case pointed out that the two London-headquartered companies received regulatory approval from the Europe Commission and enjoyed regulatory momentum around the world, but he blamed the DOJ for not creating an impasse which made the transaction impossible to conclude. 