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Associated Press
Phillip A. Bullock, Apple's head of Tax Operations, joins Apple CEO Tim Cook to testify before the Senate Homeland Security and Governmental Affairs Permanent on Investigations as lawmakers examine the methods employed by multinational corporations to shift profits offshore and how such activities are affected by the Internal Revenue Code, on Capitol Hill in Washington, Tuesday, May 21, 2013. Apple, the world's most valuable company, based in Cupertino, Calif., holds a billion dollars in an Irish subsidiary as a tax strategy, according to a report issued this week by the subcommittee.   (AP Photo/J. Scott Applewhite)(AP Photo/J. Scott Applewhite)

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