Whistleblower or national-security liability? A federal court has charged a former senior executive at the National Security Agency with lying and obstruction of justice for serving as a source that leaked classified information to a newspaper. Thomas Drake, 52, allegedly exchanged hundreds of emails with a reporter at a newspaper that published articles about the Bush administration’s intelligence policies between February 2006 and November 2007. The reporter, the newspaper, and the exact nature of the stories are unknown. Drake headed the NSA’s Signals Intelligence Directorate at Fort Meade between 2001 and 2005.