washington hillary clinton campaign chairman john podesta tuesday appear u.s. house representatives intelligence committee begin interview witness probe russia may influence 2016 election committee members decline comment discussion reporters leave panel secure hear room podesta stop comment briefly ask come forward give best knowledge know happy cooperate committee investigation russian interference democratic process unite state say republican president donald trump defeat clinton election recently accuse former democratic president barack obama little address russian cyber attack still white house monday trump demand twitter investigators apologize look russian interference possible collusion campaign accuse obama collude obstruct without provide evidence nl1n1jn12o ask whether think obama do enough podesta say think president entire administration deal unprecedented incidence weaponization fruit russian cyber activity make best judgments could behalf american people 2016 campaign hackers penetrate democratic national committee email server separately steal email podesta personal account email post online use embarrass clinton include trump frequently use content political ammunition u.s. intelligence agencies conclude russia behind hack seek boost trump chance win white house russia deny try influence election trump dismiss allegations sour grapes democrats supporters unable come term surprise victory november house intelligence panel conduct one several investigations russian meddle election possible collusion members trump campaign department justice special counsel robert mueller nl1n1ic249 house panel begin bring witness interview week expect lawmakers leave washington friday weeklong july holiday recess clinton campaign chairman testify house russia probe