The European Union ombudsman has opened an inquiry into European Central Bank President Mario Draghi’s involvement with an elite group of economic leaders. The investigation will consider Draghi’s membership of the Group of 30, a forum of finance executives, academics and policy makers including Bank of England Governor Mark Carney, Warburg Pincus LLC President Tim Geithner, Credit Suisse Group AG Chief Executive Officer Tidjane Thiam, and former ECB chief Jean-Claude Trichet.