investigation that has widened to include possible financial crimes. >> the turn in the investigation seems to cross the red line. president trump warned special counsel mueller in an interview last month with "the new york times." cnn's pamela brown has the latest. >> does anyone believe that story? >> reporter: the russia investigation continues to widen as federal investigators explore the potential financial ties of 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 too 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. >> and i can tell you speaking