ramstein air base germany u.s. secretary state rex tillerson plan trip africa first three months next year senior aide say wednesday amid speculation long tillerson might stay job early wednesday tillerson say truth report president donald trump intend fire replace cia chief mike pompeo directly address issue news conference nato headquarter brussels tillerson dismiss report overshadow week-long trip europe highlight yearn ally stability u.s. foreign policy secretary tillerson plan trip africa first quarter 2018 senior adviser r.c hammond tell reporters germany ramstein air base hammond speak stopover en route vienna tillerson due meet russian counterpart sergei lavrov thursday discuss issue north korea tillerson say normal u.s. relations russia moscow end support separatists ukraine return crimea region annex 2014 comment likely reassure western ally tillerson visit africa first quarter 2018 adviser