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Tanks deployed in Egypt, Syria sparks chemical warfare threat

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The Egyptian military has deployed tanks outside the presidential palace in Cairo following another night of violent clashes between opponents and supporters of President Morsi and his power grab. Also, U.S. officials tell NBC News the Syrian military is prepared to use chemical weapons against its own people and is awaiting final order from President Assad. What is the United States’ role in these conflicts?  Senior Fellow at the Woodrow Wilson Center, Robin Wright discusses.