washington donald trump foreign policy proposals would make world less stable place former secretary state jam baker tell u.s. senate hear thursday republican presidential candidate meet elsewhere party congressional leaders question republican senator marco rubio former trump rival presidential race baker say world would far less stable weak nato countries nuclear weapons trump propose get lot problems today hell lot case baker tell senate foreign relations committee hear add u.s. commitments around world promote u.s. security trump meet baker thursday trump request say baker spokesman decline comment hear america role world call committee republican chairman senator bob corker corker praise foreign policy speech trump give washington last month u.s. ally worry trump remark invocation america first agenda threat retreat world without name trump rubio refer businessman-turned-candidate suggestions unite state rethink north atlantic treaty organization nato japan south korea consider get nuclear weapons defend suggest let japan south korea get nuclear weapons let defend rubio ask countries acquire nuclear weapons instability go world opinion baker say tom donilon democratic president barack obama former national security adviser call rubio question important think experiment back baker comment importance nato think experiment actually propose rubio say hear take place trump capitol hill meet republican congressional leaders heal divisions within party include establishment figure like baker insurgent candidate baker republican secretary state president george bush treasury secretary president ronald reagan testify alongside donilon former presidents bush george w. bush plan endorse trump candidate year white house race u.s. foreign policy veteran warn trump would make world less stable