president trump and associates to russia. sources tell cnn financial links could offer a more concrete path to any potential prosecution. investigators are delving into possible financial crimes including some unconnected to the election. for the president, that's going to far. he's warned that delving into his businesses is a "violation." trump has maintained there's no collusion, and he has no financial ties to russia. >> i can tell you speaking for myself, i own nothing in russia. i have no loans in russia. i don't have any deals in russia. >> reporter: now, one year into this complex probe, the fbi has reviewed financial records related to the trump organization. the president himself as well as his family and campaign associates. cnn is told investigators have combed through the list of shell companies and buyers of trump-branded real estate properties. they've scrutinized the roster