Secretary Tillerson And Secretary Mattis Hold News Conference After U.S.-China Security Meeting [Getty Images]

Rex Tillerson, U.S. secretary of State, speaks during a news conference with James Mattis, U.S. secretary of defense, not pictured, following the inaugural U.S.-China Diplomatic and Security Dialogue meeting at the State Department in Washington, D.C., U.S., on Wednesday, June 21, 2017. Tillerson and Mattis hosted Chinese State Councilor Yang Jiechi and General Fang Fenghui, chief of the People's Liberation Army's joint staff department, for negotiations to expand areas of cooperation while narrowing differences on key diplomatic and security issues. Photographer: Andrew Harrer/Bloomberg via Getty Images

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