reuters.com — Markets, politicians, U.S. pressure Draghi to deliver * Sources see joint ECB action with euro zone rescue fund in Sept. * Finnish PM says euro zone preparing to buy bonds at auction By Sakari Suoninen FRANKFURT, Aug 2 (Reuters) - European Central Bank President Mario Draghi was under intense pressure from investors, European leaders and even the United States to deliver on Thursday on his pledge to do whatever it takes to save the euro.