A group of United States senators has asked Senegal's President Abdoulaye Wade not to seek another term in elections next year.

In a letter obtained by VOA , the four senators take note of street clashes in Senegal's capital earlier this year and tell Mr. Wade that the country could experience more unrest if he runs for re-election.

They warn a constitutional crisis could undo advances for democracy in Senegal, and strain the country's ties with the U.S.

The four senators include Christopher Coons, chairman of the U.S. Senate Subcommittee on Africa.

Mr. Wade, who is 85, has served two terms as Senegal's president, the constitutional limit. However, Mr. Wade's supporters say he is able to run again because the constitution was not effect when he was first elected in 2000.

Senegal's Constitutional Court has yet to rule on his eligibility.

Senegal has been peaceful compared to many other African countries but critics of Mr. Wade accuse him of becoming autocratic.

Anti-government riots paralyzed the capital, Dakar, in June, after the ruling party moved to create the post of vice president and lower the percentage of votes needed to win the presidential election.

The president's opponents said the moves were aimed at making it easier for Mr. Wade to be re-elected, and for his son, Karim Wade, to succeed him.

After the protests, the proposals were dropped.