that story? >> reporter: tonight the russia investigation continues to widen. federal investigators explore the potential financial ties with president trump and associates to russia. sources tell cnn financial links could offer a more concrete path to any potential prosecution. investigators are del ving into possible financial crimes including some unconnected to the election. for the president, that's going too far. he's warned that delving into his businesses is a, quote, violation. trump 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 the complex probe, the fbi has reviewed financial records related to the trump organization. the president himself as well as his family members and campaign associates. cnn has told investigators have combed through the list of shell