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.
U.S. Secy. of Homeland Security Jeh Johnson talks to Wolf Blitzer about whether Americans are fighting in Syria.
CNN's Brianna Keilar reports on why the Clinton family might be upstaging this week's U.N. General Assembly meeting.
Police say Jesse Matthew was the last person to seen with UVA student Hannah Graham before she disappeared.
Fmr. New York Mayor Rudy Giuliani says he is more concerned about 'lone-wolf' terrorists than organized groups like al Qaeda.
ISIS has released an audio tape in which one of its leaders calls for attacks against the West. Jim Sciutto reports.
CNN's Barbara Starr reports that ISIS forces have taken over 60 villages in northern Syria.
Brian Todd reports on a video that may show a North American member of ISIS committing a war crime.
Secy. John Kerry's address at the U.N. reminded some people of Colin Powell's case to go to war against Iraq.
Jim Sciutto reports that many intelligence officials now say they underestimated the threat posted by ISIS.