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How would US respond if Syria begins using chemical weapons?

20:24

The White House is evaluating claims that chemical weapons are being used in the fighting in Syria between rebels and the government of Bashar al-Assad, and during his four-day trip to the Middle East, President Obama said if chemical weapons were used in Syria, the action would be a "game changer." Time's Rana Foroohar and the Washington Post's Ezra Klein discuss Syria as well as Pope Francis and curing cancer.