Peter Oppenheimer

Apple CEO Cook, CFO Oppenheimer and Apple Head of tax operations Bullock are sworn in to testify at Senate homeland security and governmental affairs investigations subcommittee hearing on Capitol Hill...Apple CEO Tim Cook (C), CFO Peter Oppenheimer (L) and Apple Head of tax operations Philip Bullock are sworn in to testify at a Senate homeland security and governmental affairs investigations subcommittee hearing on offshore profit shifting and the U.S. tax code, on Capitol Hill in Washington, May 21, 2013. Apple Inc came under fire on Tuesday at a Senate hearing over an investigation that alleged the U.S. high technology icon has kept billions of dollars in profits in Irish subsidiaries and paid little or no taxes to any government.   REUTERS/Jason Reed    (UNITED STATES - Tags: POLITICS BUSINESS)

Jason Reed/Reuters

Apple chief executive Tim Cook (centre), chief finance officer Peter Oppenheimer (left) and head of tax operations Philip Bullock are sworn in to testify at a Senate homeland security and governmental affairs investigations subcommittee hearing on offshore profit shifting and the US tax code, on Capitol Hill in Washington. Apple came under fire on Tuesday at the hearing over allegations it had kept billions of dollars in profits in Irish subsidiaries and paid little or no taxes to any government.