article: Mr Deby took power in a coup in 1990 and later introduced elections. A referendum in 2005 scrapped a clause restricting presidents to two terms, but Mr Deby said that if he gets re-elected he will reinstate it. In the last year, Burundi, Rwanda and Congo-Brazzaville have all changed their constitutions to allow their presidents to run for office again. Africa Live: BBC news updates Mr Deby said on Tuesday that reinstating term limits would provide "vitality" to the democracy. "We must limit terms, we must not concentrate on a system in which a change in power becomes difficult," he told the ruling party. "In 2005 the constitutional reform was conducted in a context where the life of the nation was in danger," he added. Africa's longest-serving leaders: The arrogance of power The Mobutu and Gaddafi effect
summary: Chad's President Idriss Deby has announced he will run for a fifth term in April's elections.