washington russia ambassador washington sergei kislyak key figure ongoing u.s. investigations moscow meddle 2016 presidential election end tenure saturday russian embassy washington say twitter fee minister-counseler deputy chief mission denis v. gonchar would serve charge affaires kislyak successor arrive kislyak hold post since 2008 expect replace russian deputy foreign minister anatoly antonov antonov nomination post yet approve kremlin come time intense scrutiny moscow-washington relations follow u.s. allegations russia meddle u.s. election last year kislyak name emerge relation several trump associate special counsel congressional panel investigate russian meddle possible tie trump campaign friday washington post report kislyak overhear u.s. spy agencies tell boss discuss campaign-related matter include issue important moscow jeff sessions 2016 presidential race attorney general sessions recuse march matter connect investigation fbi follow admission talk russian envoy sessions deny discuss campaign issue russian officials say meet kislyak role u.s. senator former white house national security adviser michael flynn force resign february become know fail disclose content conversations kislyak mislead vice president meet trump senior adviser son-in-law jar kushner also fail disclose contact russia seek security clearance new york time report april white house disclose march kushner meet kislyak trump tower december 2016 addition see kislyak attend april 2016 campaign speech washington white house say december meet establish line communication kushner also phone call kislyak april november 2016 reuters report kushner attorney say kushner recollection call participate thousands call time period moscow deny interference trump say campaign collude russia white house say week trump would nominate jon huntsman new ambassador russia russian envoy heart u.s. investigations end tenure washington