Does Obama Have to Act in Syria?

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President Obama has warned Syria that using—or even transporting--chemical weapons would be a “game changer.”  Britain, France and Israel now claim that the al-Assad regime has thrown down the gauntlet.  Syria denies the charge, but is the evidence credible?  Will the US have to respond?  What are the available options?


Banner Photo © Reuters - Handout photo from SANA, Syria's national news agency.