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Amid a chill in relations over the war in Iraq , which Canada opposed , Bush indefinitely postponed a visit to Canada , instead choosing to host Australian Prime Minster John Howard , who endorsed that military campaign .
 Iraq: place
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: attack 
  Option: victim, attacker, place, target, instrument 
Text: {0} 
Answer:
 Iraq: place