washington senate intelligence committee investigate russian meddle u.s. 2016 election ask president donald trump political organization hand document go back campaign launch june 2015 washington post report friday cite two people brief request letter senate panel seek document email telephone record arrive trump campaign committee last week address treasurer post say mark first time trump campaign organization draw bipartisan committee investigation russian interference presidential election say dozens former campaign staffers expect contact soon ensure aware request post say cite two people letter sign republican senator richard burr committee chairman senator mark warner top democrat accord post say representatives burr warner decline comment senate panel investigation among several congress russian interference election separate probe matter lead special counsel appoint last week justice department former federal bureau investigation director robert mueller trump campaign committee base trump tower new york lead michael glassner former deputy campaign manager john pence nephew vice president mike pence post say glassner immediately respond request comment white house representative immediate comment post say trump administration dog concern tie russia question whether trump associate may cooperate russians seek meddle last year election trump behalf u.s. intelligence agencies conclude january moscow try sway november vote trump favor russia deny involvement trump deny collusion campaign russia controversy engulf trump since fire fbi director jam comey may comey oversee investigation possible collusion presidential campaign russia senate intelligence panel request trump campaign document washington post