Obama rules out unilateral U.S. military action on Syria

President Obama says he is not prepared to send U.S. forces to try to stop the carnage in Syria or to help oust Bashar Assad, as some Republicans in Congress have urged.

President Obama on Tuesday ruled out a unilateral U.S. military campaign to support the beleaguered rebels in Syria, calling such an operation "much more complicated" than the NATO-led air war launched to help protect civilians during the civil war in Libya last year.

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