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.
On Sunday, Secretary of State John Kerry said the U.S. has discovered "signatures of sarin" gas that prove the al-Assad regime used chemical weapons. Brian Todd investigates what those signatures are and how reliable the evidence is.
CNN's Tom Foreman shows how Syria is bracing for a U.S. attack and how the Russians are helping the al-Assad regime.
Some of President Obama's critics say delaying action in Syria gives the al-Assad regime time to hide key targets, but Pentagon officials say strikes will be as effective one month from now as they are today. CNN's Chris Lawrence investigates.
Lawmakers are largely skeptical towards possible military action in Syria. CNN's Dana Bash reports.
Wolf Blitzer asks Gen. Salim Idris, the leader of the Free Syrian Army, about another chemical weapons attack and how trustworthy the rebel groups are.
Jeanne Moos reports on a police boat that caused an accident of its own.
The daughters of former Vice President Dick Cheney spar over same-sex marriage. CNN's Athena Jones reports.