The leaders agreed to hold a presidential summit in Buenos Aires, Argentina, later this month to discuss the matter after Venezuelan President Hugo Chavez raised it during a ceremony to inaugurate Ecuadorean President Rafael Correa as temporary president of the Union of South American Nations, or Unasur. Luiz Inacio Lula da Silva, of Brazil, Cristina Fernandez, of Argentina, Evo Morales, of Bolivia, Fernando Lugo, of Paraguay, and Ecuador's Correa also expressed unease with the plan. "I don't want to sabotage your ceremony Rafael ... (but) we are very worried," said Chavez, who added that he believes the bases will destabilize the region. Read more here. Semana International delivers news about Colombia in English. Find more in our home.