washington top democrats u.s. house representatives refuse endorse republican move find pay firm commission dossier allege tie donald trump presidential campaign russia court document make public monday show split late sign partisan feud current former u.s. officials say undercut house intelligence committee probe allegations russian interference 2016 presidential election republicans committee early month subpoena unidentified bank last two years record account fusion gps political research firm hire former british intelligence officer christopher steele pull together dossier trump move apparent effort find pay work lead dossier firm assure clients disclose identities source familiar situation say law firm perkins coie retain fusion gps behalf democrat hillary clinton presidential campaign democratic national committee aid representation clinton presidential campaign democratic national committee perkins coie retain fusion gps enter engagement research service begin april 2016 conclude election early november source say perkins coie involvement pay research first report washington post tuesday last week fusion gps sue unnamed bank federal court washington request court order block subpoena monday night court file lawyers house say represent intelligence committee ask court reject fusion request legal challenge make without support democrats throw question tradition bipartisanship congress intelligence issue democrats minority republicans house panel want investigate russia role 2016 election well allegations trump team collude kremlin moscow deny meddle election trump deny collusion representative devin nunes intelligence committee republican chairman ally focus instead issue include activities fusion gps republicans include senator charles grassley chair senate judiciary committee charge fusion gps take russian money compile dossier trump domestic american clients pay fusion gps research donald trump period russian involve way payment fusion gps work joshua levy outside attorney firm say statement reuters tuesday footnote monday court file say house lawyers go court enforce subpoena authorization bipartisan legal advisory group entire house add house democratic leader democratic whip decline support group position case representative nancy pelosi house democratic leader representative steny hoyer democratic whip top democrat intelligence committee representative adam schiff immediately available comment court file house lawyers argue fusion gps right quash valid congressional subpoena relief plaintiff seek extraordinary would directly impede ongoing congressional investigation high national importance write file file confirm nunes retain control committee russia probe despite say april would step aside let fellow republican representative mike conaway take charge nunes recuse investigation document say u.s. partisan split widen russia probe court document