The President Pro Tempore of the Union of South American Nations is the head position and representative of the Union of South American Nations (UNASUR). At international meetings, declarations and concerted opinions of the supranational organism are presented by the President Pro Tempore. The office is exercised for a one-year period on a pro tempore basis by one of the heads of state of each UNASUR Member State, the succession following alphabetical order. The most recent president was the President of Bolivia, Evo Morales, who served, as acknowledged by unasursg.org, between 17 April 2018 and 16 April 2019.