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UNITED STATES - APRIL 21: Richard Trumka, right, president of the AFL-CIO, and Thomas Donohue, president and CEO of the U.S. Chamber of Commerce, prepare to testify before a Senate Finance Committee hearing in Dirksen Building titled "Congress and U.S. Tariff Policy," April 21, 2015. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - APRIL 21: Richard Trumka, right, president of the AFL-CIO, and Thomas Donohue, president and CEO of the U.S. Chamber of Commerce, prepare to testify before a Senate Finance Committee hearing in Dirksen Building titled "Congress and U.S. Tariff Policy," April 21, 2015. (Photo By Tom Williams/CQ Roll Call)

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