washington three democratic u.s. senators write senior administration officials monday seek confirmation whether white house counterterrorism adviser sebastian gorka criminal investigation fail disclose membership hungarian neo-nazi organization senior counterterrorism advisor mr. gorka position great importance public trust american people entitle know senior white house official criminal investigation senators dick durbin richard blumenthal benjamin cardin say letter say letter follow-up letter send march call investigation whether gorka falsify naturalization application otherwise illegally procure american citizenship gorka reportedly conceal membership vitezi rend far-right anti-semitic hungarian organization historical tie nazis apply u.s. citizenship senators say monday letter white house immediately respond request comment senators letter address deputy attorney general rod rosenstein elaine duke act secretary department homeland security democratic senators press whether white house aide probe