The FBI is going straight to the source in its investigation of classified emails that crossed Hillary Clinton's personal server, speaking with the intelligence agencies - and in some cases, the individuals - that generated the information, two intelligence sources familiar with the probe told Fox News. Investigators are meeting with the agencies and individuals to determine the classification level in the emails. The step speaks to the diligence with which the bureau is handling the investigation, despite the former secretary of state's claims that the matter boils down to a mere interagency dispute. "This is not merely a difference...