Bloomberg reported that one executive - deputypresident of Coca-Cola's Pacific Group, Paul Etchells - opened an email he thought was from the company's chief executive.
Mr Brennan, 57, is a veteran of the CIA, having spent 25 years at the agency in various posts including station chief in Saudi Arabia and deputyexecutive director in the administration of former President George W Bush.
Biden was to announce plans to introduce the bill at a press conference Thursday with AOL chief executive officer Stephen Case, CaseFoundation president Jean Case and Deputy Attorney General Eric Holder.