washington u.s. president barack obama say possible russia would try influence u.s. presidential election leak democratic national committee email experts attribute russian hackers anything possible obama tell nbc news interview broadcast tuesday ask russians would try influence nov. election obama say federal bureau investigation investigate leak friday 19,000 dnc email show committee favor hillary clinton senator bernie sanders party presidential nomination know experts attribute russians obama say know russians hack systems government systems private systems say email leak force congresswoman debbie wasserman schultz florida resign chairwoman democratic national committee clinton receive democratic nomination tuesday party convention philadelphia face republican donald trump election motives term leak say directly know donald trump repeatedly express admiration vladimir putin obama say trump often praise putin call strong leader new york businessman also tell new york time last week white house nato might automatically defend baltic state part russian-led soviet union think trump get pretty favorable coverage back russia obama say obama say possible russia would try sway u.s. election