Turkey is to vote on April 16 on whether to approve changes in the constitution to create an executive presidency in the country that critics warn could lead to one-man rule.
But Ozan Erdem, deputy head of the ruling Justice and Development Party (AKP) in the western province of Manisa, this week warned that "if we don't get 50 per cent... Prepare yourself for civil war."
Erdem resigned from his job today, while contending that "my comments were not presented in a way that reflected what I wanted to say."
The authorities say that the changes are needed to create more efficient governance and would bring Turkey into line with presidential systems like those in France or the United States.
But opponents fear the changes are a step on the way to an authoritarian system in the country and would inflame tensions in its diverse society.