washington u.s. political research firm commission dossier donald trump run president say monday would comply subpoena issue u.s. house representatives intelligence committee lawyers fusion gps hire former british spy christopher steele produce trump research tell committee republican chairman u.s. representative devin nunes letter subpoena flaw nothing subpoena indicate intelligence committee authorize issue lawyers also question nunes role sign subpoena since recuse committee investigation allege russian interference 2016 u.s. presidential campaign act another example chair run operation parallel committee investigation say lawyers note subpoena make public order central intelligence agency produce document point fusion gps firm representatives receive subpoena relationship cia letter accuse house committee bad faith interactions fusion lawyers say leave us choice advise clients assert privilege face subpoena request committee excuse fusion representatives testify committee force appear invoke constitutional privilege testify representatives nunes immediately respond email request comment august senate judiciary committee also investigate steele dossier meet 10 hours fusion founder glenn simpson committee release transcript simpson testimony dossier assemble former mi6 officer christopher steele outline russian financial personal link trump campaign associate senate intelligence committee special counsel robert mueller look possible collusion russia trump campaign mueller investigators meet steele firm behind trump dossier decline respond house panel 's subpoena