US-ENERGY-OIL-EXXON-TILLERSON

Exxon Mobil chairman and CEO Rex Tillerson gestures while speaking at a discussion organized by the Economic Club of Washington on the energy innovations that have led to a new era of energy abundance for North America in Washington, DC on March 12, 2015. AFP PHOTO/ NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

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