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WASHINGTON, DC - JANUARY 11: Former ExxonMobil CEO Rex Tillerson, U.S. President-elect Donald Trump's nominee for Secretary of State, testifies during his confirmation hearing before the Senate Foreign Relations Committee January 11, 2017 on Capitol Hill in Washington, DC. Tillerson is expected to face tough questions regarding his ties with Russian President Vladimir Putin. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JANUARY 11:  Former ExxonMobil CEO Rex Tillerson, U.S. President-elect Donald Trump's nominee for Secretary of State, testifies during his confirmation hearing before the Senate Foreign Relations Committee January 11, 2017 on Capitol Hill in Washington, DC. Tillerson is expected to face tough questions regarding his ties with Russian President Vladimir Putin. (Photo by Alex Wong/Getty Images)