washington/new york fbi investigate email part probe hillary clinton use private email system say friday new twist could damage democratic candidate 2016 presidential race federal bureau investigation director jam comey say letter senior lawmakers agency would determine whether additional email contain classify information add know long take us complete additional work announcement come clinton republican opponent donald trump enter final stretch campaign ahead nov. election news conference late friday des moines iowa clinton urge comey release detail fbi look newly discover email lead trump opinion poll bruise campaign struggle convince voters trustworthy honest fresh revelations use email unlikely assuage concern question around fbi investigation likely dog come days campaign across battleground state u.s. stock immediately fell sharply news go partially recover fbi spend year investigate clinton use unauthorized server home chappaqua new york u.s. secretary state classify government secrets find email comey say july evidence potential violations statutes regard handle classify information judgment reasonable prosecutor would bring case although comey recommend criminal charge bring clinton trump repeatedly say email practice criminal disqualify office seize friday development rally maine new hampshire big political scandal since watergate sure properly handle point forward trump tell crowd lisbon maine hope justice fully serve say supporters cheer word chant lock up clinton say learn newly discover email news report confident whatever change conclusion reach july say incumbent upon fbi tell us go on two source close investigation say late email discover investigation clinton rather part separate probe anthony weiner estrange husband top clinton aide huma abedin fbi investigate illicit text message allegedly send weiner 15-year-old girl north carolina find clinton email device relate investigation source say abedin tell federal investigators april use several email account work include yahoo email accord summary interview release fbi september say difficult print state department email system routinely forward document private account need print accord summary abedin announce separation weiner august sex scandal similar early incident lead resign u.s. congress lawyers represent abedin respond question send email friday weiner immediately respond email seek comment respond phone call hank sheinkopf democratic strategist previously advise former president bill clinton role hillary clinton campaign say link clinton email woes weiner sex scandals make hard campaign distinguish trump sex scandals whole campaign smear sex corruption scandal say nobody remember begin something remember end go remember sex scandal corruption email people go trouble sort information clinton campaign chairman john podesta say extraordinary fbi release letter close end hotly contest election director owe american people immediately provide full detail examine podesta say statement confident produce conclusions different one fbi reach july clinton repeatedly apologize use private email server home instead government email account work secretary state 2009 2013. say knowingly send receive classify information fbi probe new email likely prove distraction clinton come days unclear impact would americans go poll election experts say 20 percent ballot already cast americans vote mail go poll early lot concern email already bake electoral cake think say linda fowler professor government dartmouth college know know inappropriate fail sensational revelation nov. hard see go make big difference still republican lawmakers face difficult fight keep majorities u.s. senate house representatives leap condemn clinton house speaker paul ryan reiterate call democratic nominee bar brief involve classify information investigation reince priebus head republican national committee say fbi decision look email show serious discovery must be clinton respond reporters shout question news leave plane campaign stop cedar rapids iowa u.s. stock decline volatile session friday partially recover sharp drop spur fbi announcement dow jones industrial average close day point .05 percent benchmark 10-year treasury note unchanged day dollar also fell major currencies clinton email problem resurface fbi announce review