Bashar Assad

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There are numerous reports of Syrian President Bashar Assad using chlorine bombs against rebel forces over the past several weeks. (Associated Press)

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Syrian President Bashar Assad gestures during an interview with the BBC, in Damascus, Syria, in this Tuesday, Feb. 10, 2015, file photo released by the Syrian official news agency SANA. (AP Photo/SANA, File)

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Syrian President Bashar Assad presents a snag in U.S.-Iran nuclear arms talks. (AP Photo/Vadim Ghirda)

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ready, aim, fire: Hours before an American-led military coalition pounded Islamic State strongholds in Syria, the Obama administration informed President Bashar Assad of its plans. (U.S. Navy via Associated Press)

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This photo provided by an anti-Bashar Assad activist group Edlib News Network (ENN), which has been authenticated based on its contents and other AP reporting, shows a Syrian boy, left, looking at a destroyed car that activists say was targeted by the coalition airstrikes, in the village of Kfar Derian, a base for the al-Qaida-linked Nusra Front, a rival of the Islamic State group, between the northern province of Aleppo and Idlib, Syria, Tuesday Sept. 23, 2014. Syria said Tuesday that Washington informed President Bashar Assad's government of imminent U.S. airstrikes against the Islamic State group, hours before an American-led military coalition pounded the extremists' strongholds across northern and eastern Syria. (AP Photo/Edlib News Network ENN)

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This photo provided by an anti-Bashar Assad activist group Edlib News Network (ENN), which has been authenticated based on its contents and other AP reporting, shows Syrian citizens checking a damaged house that they say was targeted by the coalition airstrikes, in the village of Kfar Derian, a base for the al-Qaida-linked Nusra Front, a rival of the Islamic State group, between the northern province of Aleppo and Idlib, Syria, Tuesday Sept. 23, 2014. Syria said Tuesday that Washington informed President Bashar Assad's government of imminent U.S. airstrikes against the Islamic State group, hours before an American-led military coalition pounded the extremists' strongholds across northern and eastern Syria. (AP Photo/Edlib News Network ENN)

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This photo provided by an anti-Bashar Assad activist group Edlib News Network (ENN), which has been authenticated based on its contents and other AP reporting, shows Syrian citizens checking a damaged house that they say was targeted by the coalition airstrikes, in the village of Kfar Derian, a base for the al-Qaida-linked Nusra Front, a rival of the Islamic State group, between the northern province of Aleppo and Idlib, Syria, Tuesday Sept. 23, 2014. Syria said Tuesday that Washington informed President Bashar Assad's government of imminent U.S. airstrikes against the Islamic State group, hours before an American-led military coalition pounded the extremists' strongholds across northern and eastern Syria. (AP Photo/Edlib News Network ENN)

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This photo provided by an anti-Bashar Assad activist group Edlib News Network (ENN), which has been authenticated based on its contents and other AP reporting, show according to them Syrian citizens check a damaged house that targeted by the coalition airstrikes, in the village of Kfar Derian, a base for the al-Qaida-linked Nusra Front, a rival of the Islamic State group, between the northern province of Aleppo and Idlib, Syria, Tuesday Sept. 23, 2014. Syria said Tuesday that Washington informed President Bashar Assad's government of imminent U.S. airstrikes against the Islamic State group, hours before an American-led military coalition pounded the extremists' strongholds across northern and eastern Syria. (AP Photo/Edlib News Network ENN)

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Photographs of victims of the Assad regime are displayed as a Syrian Army defector known as "Caesar," center, appears in disguise to speak before the House Foreign Affairs Committee at a briefing called "Assad's Killing Machine Exposed: Implications for U.S. Policy" concerning the Assad regime, on Capitol Hill, Washington, D.C., Thursday, July 31, 2014. "Caesar" was apparently a witness to Bashar Assad's brutality and smuggled more than 50,000 photographs depicting the torture and execution of more then 10,000 dissidents. (Andrew Harnik/The Washington Times)