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Former US President George W. Bush (L) and Vice President Dick Cheney talk on December 3, 2015, during a dedication ceremony hosted by the US Senate at Emancipation Hall of the US Capitol Visitor Center in Washington, DC. The ceremony unveiled a bust of former Cheney, who as vice president, also served as President of the Senate. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

Former US President George W. Bush (L) and Vice President Dick Cheney talk on December 3, 2015, during a dedication ceremony hosted by the US Senate at Emancipation Hall of the US Capitol Visitor Center in Washington, DC. The ceremony unveiled a bust of former Cheney, who as vice president, also served as President of the Senate. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)