Senator John McCain in Syria
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Senator John McCain's surprise Syria visit

28 May 2013 Last updated at 09:40 BST

One of the strongest advocates of US military aid for the Syrian opposition, Senator John McCain, has made an unannounced visit to Syria for talks with rebel commanders.

The rebels called for a change in American policy, demanding the provision of heavy weapons, the imposition of a no-fly zone and air strikes on Hezbollah fighters inside Syria.

David Willis reports from Washington.