washington u.s. republican congressional leaders refuse democrats call special prosecutor select committee investigate possible link president donald trump campaign russia say investigations congressional committees sufficient u.s. intelligence agencies say january russian president vladimir putin order hack democratic national committee hillary clinton campaign chairman computers influence election trump behalf russia deny three u.s. agencies cia national security agency federal bureau investigation well justice department launch investigations matter democratic president barack obama addition ways congressional committees look matter house intelligence committee house permanent select committee intelligence begin investigation potential russian influence 2016 presidential race trump take office jan. 20. panel chairman republican representative devin nunes play lead role trump transition prompt critics question whether close republican president conduct fair investigation nunes statements contribute concern include confirmation speak journalists white house request dispute report trump campaign contact russia nunes also say want investigation turn witch hunt like 1950s mccarthy congressional hear americans allege link communism committee members push full access information collect cia fbi agencies recently say access improve panel hold first public hear matter march 20. fbi director jam comey leaders former leaders major u.s. intelligence agencies invite testify representative adam schiff top democrat committee say know yet whether panel capable conduct credible investigation senate intelligence committee u.s. senate select committee intelligence conduct investigation also start trump take office consider robust congressional action chairman richard burr re-elected november republican sweep carry trump office preserve republican control congress although trump supporter campaign closely link president nunes also make call reporters white house try dispute allegations campaign contact russia senator mark warner committee democratic vice chairman say grave concern independence committee probe report burr help white house dispute stories burr warner express few concern members house committee amount information intelligence agencies provide senate intelligence committee hold open hear russian efforts influence campaign generally march 30. witness list include experts current trump administration intelligence community officials senate judiciary committee republican senator lindsey graham chairman panel subcommittee crime terrorism sheldon whitehouse rank democrat announce would investigate russian attempt influence election also ask fbi justice department produce information support trump unsubstantiated claim predecessor wiretapped 2016 campaign full judiciary committee also investigate chairman chuck grassley top democrat dianne feinstein officials brief panel members grassley feinstein also send joint letter comey ask brief transcripts document call michael flynn trump former national security adviser russian ambassador sergei kislyak house judiciary committee committee democrats try force committee ask department justice produce record investigation whether trump campaign tie russia panel republicans block effort committee chairman representative bob goodlatte say instead would urge government continue investigation however goodlatte say ask justice department brief committee response house oversight committee jason chaffetz committee republican chairman resist call investigate trump administration michael flynn resign trump national security adviser call russia ambassador chaffetz say panel would look issue however sign letter seek relate information among first lawmakers call attorney general jeff sessions recuse russia-related investigations contact kislyak factbox congress investigate link trump russia