The US State Department has warned relations with Russia would be affected if it granted asylum to US intelligence leaker Edward Snowden.
But the spokesman added: "However we are not at that point yet. They still have the opportunity to do the right thing and return Mr Snowden to the United States and that's what our hope is."
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During their visit, Charles and Camilla will meet local businesses and people in the city centre before joining a reception in the Guildhall