A U.N. chemical weapons expert gathers evidence at one of the sites of an alleged poison gas attack in the southwestern Damascus suburb of Mouadamiya August 26, 2013. The United Nations said on Monday it was still possible for the U.N. team of chemical weapons experts to gather evidence necessary to investigate last week's alleged gas attack despite the lapse of time. REUTERS/Ahmad Alshami (SYRIA - Tags: POLITICS CONFLICT HEALTH) - RTX12X7W


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As UN inspectors in Syria looked for evidence of the Syrian government's possible use of chemical weapons, President Obama and his administration are pondering a response to Syria's alleged crossing of Obama's famous red line. Anchor Marco Werman speaks with Marc Lynch, Director of the Institute for Middle East Studies at George Washington University about the mood in Washington over the weekend as pressure mounts for a US response in Syria.

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