President Obama discusses the situation in Syria on Friday from the White House Cabinet Room. Getty Images hide caption

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President Obama pauses after answering questions from the news media during his meeting with Baltic leaders at the White House on Friday. Pablo Martinez Monsivais/AP hide caption

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Syrian President Bashar Assad delivers a speech at an iftar dinner with political and religious figures in Damascus, Syria, on Aug. 4. In Syria, many different religious groups live in an often uneasy mix. While the country is primarily Sunni Arab, the government is run by minority Alawites like Assad — adherents of an offshoot of Shiite Islam. AP/SANA hide caption

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Pakistani Army soldiers guard nuclear-capable missiles at the International Defence Exhibition in Karachi in 2008. The Washington Post reports that concern over their security is a "blind spot" in U.S. intelligence efforts. Rizwan Tabassum/AFP/Getty Images hide caption

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U.S. Defense Secretary Chuck Hagel, center, chains his hands with his counterparts from Vietnam, right, and Thailand before the ASEAN meeting in Bandar Seri Begawan, Brunei, on Thursday. The trip's message: The U.S. is committed to its "rebalance" toward the Asia-Pacific region. Vincent Thian/AP hide caption

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A month after U.S. naval ships shelled Lebanon, Muslim extremists blew up the U.S. Marine barracks in Beirut, killing 241 U.S. military personnel on Oct. 23, 1983. Over the past three decades, limited U.S. military strikes have been followed on several occasions by major attacks against U.S. targets. Bill Foley/AP hide caption

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The New York Times headquarters building in New York City. Ramin Talaie/Getty Images hide caption

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Edward Snowden, seen during a video interview with The Guardian. Glenn Greenwald/Laura Poitras /EPA/LANDOV hide caption

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Female rebel fighters gather in Syria's northern city of Aleppo on Saturday to protest what they claim was a chemical attack by pro-government forces in a suburb of Damascus. AFP/AFP/Getty Images hide caption

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