A former FBI counterterrorism agent has hinted at a vast and intrusive surveillance network used by the U.S. government to monitor its own citizens. Tim Clemente admitted as much when he appeared on CNN Wednesday night. Discussing the Boston Marathon attack and past telephone conversations of Katherine Russell and her now deceased husband, suspect Tamerlan Tsarnaev, Clemente said that those conversations would be available to investigators. Clemente discussed the issue in this exchange with host Erin Burnett, as recorded by the CNN transcript...