| http://www.w3.org/ns/prov#value | - ighted ongoing U.S. worries about how Canada conducts risk assessments of people entering the country and very real differences in immigration and visa policy.That of course is a security concern, she said.Christopher Sands, a Canada-U.S. border expert at the Hudson Institute, called Napolitano's comments arresting and said they show Washington is not yet convinced that Canada has done enou
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