In March 2003, the United States and its allies, the United Kingdom, Australia and Poland invaded Iraq. The UK, Australia and Poland are all states parties to the ICC Statute and therefore their nationals are liable to prosecution by the court for any relevant crimes. As the United States is not a state party, American citizens can only be prosecuted by the court if the crime takes place in the territory of another state party (e.g. Jordan), or if the situation is referred to it by the Security Council.