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WASHINGTON, DC - APRIL 12: U.S. Defense Secretary James Mattis (C) arrives at the Rayburn House Office Building before testifying to the House Armed Services Committee on Capitol Hill April 12, 2018 in Washington, DC. Mattis and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford are scheduled to testify about their FY2019 defense budget request. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - APRIL 12:  U.S. Defense Secretary James Mattis (C) arrives at the Rayburn House Office Building before testifying to the House Armed Services Committee on Capitol Hill April 12, 2018 in Washington, DC. Mattis and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford are scheduled to testify about their FY2019 defense budget request.  (Photo by Chip Somodevilla/Getty Images)