Petraeus' biographer under FBI investigation

NBC's Richard Engel and the Washington Post's David Ignatius discuss the breaking news of CIA director David Petraeus' resignation. By Richard Engel, NBC News The biographer for resigning CIA Director David Petraeus is under FBI investigation for improperly trying to access his email and possibly gaining access to classified information, law enforcement officials told NBC News on Friday. Paula Broadwell is the author of Petraeus' biography, "All In." She had extensive access to Petraeus in Afghanistan and has given numerous television interviews speaking about him.  Petraeus resigned Friday, citing an extramarital affair. The woman involved was not identified. The law enforcement officials said they do not believe the FBI investigation will result in any criminal charges. They also stressed that Petraeus is not under investigation. The CIA declined all comment on the case. Broadwell could not be reached for comment. Broadwell's Twitter account describes her as a national security analyst and Army veteran. A biography on her website says she is married to a radiologist and has two children, both boys. The family lives in Charlotte, N.C. The biography says she is a West Point graduate and a research associate at Harvard University's Center for Public Leadership and a doctoral candidate in the Department of War Studies at King's College London. Richard Engel is NBC News' chief foreign correspondent. Author Paula Broadwell joins Morning Joe to discuss her new book on Gen. David Petraeus, bringing attention to troops who suffer from PTSD, and the relationship between Gen. Petraeus and Gen. Stanley McChrystal.