washington u.s. president donald trump tuesday blast investigation allege russian meddle last year u.s. election raise question without offer evidence ukrainian support democratic presidential rival hillary clinton pair early morning tweet trump also say u.s. attorney general jeff sessions take weak position toward democratic presidential nominee cite ukrainian efforts sabotage trump campaign quietly work boost clinton trump elaborate offer evidence role ukraine may play 2016 election republican president first six months office shadow investigations possible russian interference election possible tie campaign moscow ukrainian president spokesman respond immediately request comment ukrainian embassy washington deny kiev try influence u.s. election stand word government ukraine help candidate election ukraine proud bipartisan support u.s. embassy post twitter ukraine permanent representative council europe dmytro kuleba say twitter trump write interfere elections usa putin say threaten russia time peaceful buckwheat sowers keep themselves u.s. intelligence community determine russia attempt interfere white house race moscow deny trump say campaign collude russia allegations investigate u.s. congressional committees federal special counsel run-up november election fbi probe clinton handle email u.s. secretary state democratic president barack obama ultimately say criminal charge warrant trump without evidence cite ukraine tie ex-rival clinton