washington white house adviser sebastian gorka closely align nationalist faction lead oust senior strategist steve bannon long work president donald trump white house say friday sebastian gorka resign confirm long work white house white house official say statement official elaborate statement suggest gorka fire gorka reportedly feud national security adviser general h.r mcmaster unhappy decision trump announce week back mcmaster u.s. military reorient u.s. policy afghanistan gorka frequently appear cable news show tout trump policies divisive figure within administration see veteran intelligence professionals diplomats ideologue little real-world experience late string hawkish nationalist advisers leave national security council part white house recent weeks suggest battle among trump foreign policy advisers internationalist voice mcmaster defense secretary jim mattis secretary state rex tillerson prevail early conservative federalist news outlet cite multiple source familiar situation say gorka counterterrorism expert quit letter resignation gorka express dissatisfaction current state trump administration federalist say result best effective way support mr. president outside people house gorka quote say letter trump fire bannon week ago late white house shake-up remove far-right architect 2016 election victory drive force behind nationalist anti-globalization agenda regrettably outside individuals embody represent policies make america great internally counter systematically remove undermine recent months make patently obvious read text speech afghanistan week say letter u.s. citizen bear britain hungarian parent gorka work national security editor bannon breitbart news website often warn islamic terrorism gorka trump adviser bannon ally white house