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With opposition hardening , the White House left open the possibility Tuesday that it would not seek a United Nations vote on its war - making resolution if the measure was headed for defeat .
 White House: 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:
 White House: attacker