The Australian federal system constitutionally divides powers between the Commonwealth or federal government and six states.
All laws made by parliament must pass through both the House of Representatives and the Senate and then signed by the Governor General.
Sydney University's Professor Rodney Smith says the federal government plays a key role in Australian politics.
The Senate, often called the Upper House, comprises 76 members, twelve from each of the six states and two from each of the two territories.
Its main role is to review legislation that comes from the government of the day.
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