Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-6:30pm ET on CNN.
A train carrying oil in North Dakota derailed, causing a massive explosion.
A pair of deadly blasts is raising questions about Russia's ability to handle security at the upcoming Winter Olympics.
While it's no secret that American public support for the war in Afghanistan is low, new numbers reveal just how low.
A young generation of NSA hackers may be intercepting computer shipments and creating "dummy" web pages to monitor users.
Republicans dispute a New York Times report that found no evidence of Al Qaeda involvement in the 2012 Benghazi attack.