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The call reflected the insistent demand made by the three leaders before the US - British invasion of Iraq that UN approval was essential for any mission to topple Iraqi President Saddam Hussein .
 US: attacker; British: attacker
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:
 US: attacker; British: attacker