Tunisia's independence is at threat when foreign states seek to influence the course of the presidential elections, the country's President Mohamed Moncef Marzouki said.
Anadolu Agency reported Marzouki saying: "We are facing the legacy of 50 years of tyranny and must be prepared to overcome it and prevent it from returning."
He called on his supporters to "monitor the voting process from the beginning to the last minute and be aware of the occurrence of fraud or forgery".
"Tunisia is now facing serious risks from the lack of food and the problems of energy and water which must be put forward at the moment. What we have reached in Tunisia is the result of patience and fortitude and a party which waivered power to serve our country's interests," he said in reference to the Ennahda Islamist movement.
Marzouki invited rival candidate Beji Caid Essebsi to join him in a televised debate to discuss the issues that concern Tunisians.
The second session of presidential elections began yesterday and will continue until December 19.