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WASHINGTON (AP) - President Barack Obama and British Prime minister David Cameron have conferred for the second time in recent days. The subject: response plans to Syrian President Bashar Assad's alleged use of chemical weapons against his own people.

But any military action by the U.S. and international partners is unlikely to come before Thursday. That's when Cameron will convene an emergency meeting of Parliament where lawmakers are expected to vote to clear the way for a British response to the purported chemical weapons attack.

Meanwhile, U.S. intelligence agencies are preparing to release intercepted communications aimed at proving Assad perpetrated a large-scale chemical weapons attack on civilians.

Administration officials argue that Assad's actions pose a direct threat to U.S. national security. That gives Obama potential legal authorization to strike without authorization from the United Nations or Congress.

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