After the shooting spree at Washington's Navy Yard, President Barack Obama ordered a review of security clearance policies across the government. Yesterday, Secretary of Defense Chuck Hagel reiterated the president's directive for a broad review. Hagel said in hindsight there were red flags in the background of Aaron Alexis, the man who killed 12 people at the Navy Yard. Critics say the tragedy might have been prevented if more stringent security clearance procedures had been in place. Others argue the procedures are sound, but not always followed as closely as they should be. Diane and her guests discuss new concerns about background checks and security clearances.