Limited action 'could deter chemical weapons use'

President Barack Obama said the goal of a limited military action would be to deter future use of chemical weapons in Syria.

"If we are saying in a clear and decisive but very limited way, we send a shot across the bow saying, stop doing this, this can have a positive impact on our national security over the long term," he told PBS's NewsHour.

Obama also said the US could use an approach in Syria that does not draw it into "a long conflict" or a "repetition" of the Iraq War:

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Arab League backs UN action

The Arab League has called for United Nations and international measures against Syria over the recent chemical weapons gas attack.