washington democrats congress include party senate leader harry reid ask fbi investigate concern russian government may attempt undermine u.s. presidential election cyber attack could include tamper vote result prospect hostile government actively seek undermine free fair elections represent one grave threats democracy since cold war reid say letter fbi director jam comey reid letter date saturday first obtain new york time share website monday follow tuesday letter four democrats ask comey assess whether campaign officials work republican presidential candidate donald trump may collude russian interest carry recent hack democratic national committee democratic congressional campaign committee order interfere u.s. presidential election letter sign representatives elijah cummings john conyers elliot engel bennie thompson serve top democrat different congressional committee republicans control house representatives senate comey speak cyber security conference tuesday decline give detail federal bureau investigation probe connection political hack indicate agency closely watch foreign countries take seriously effort actor ... especially nation state move beyond collection information ... offer prospect effort influence conduct affairs country whether election something else say two letter follow spate hack attack target u.s. political databases include officials cyber security experts blame hackers work russian government kremlin officials deny fbi examine breach voter registration databases illinois arizona specify might behind reid say threat russian government tamper election extensive widely know may include intent falsify official election result also voice concern possible russian government efforts manipulate trump campaign ahead nov. election use vehicle advance interest russian president vladimir putin democrats seek fbi probe allegations russia seek influence u.s. vote