Legal provisions for optional referendums at national level

Rwanda
Constitutionof the Republic of Rwanda
(Adoptedin June 2003, last amended in December 2003)
http://www.rwandahope.com/constitution.pdf
Article109 (Optional)
Uponthe proposal of the Cabinet and after receiving an advisory opinion of theSupreme Court, the President of the Republic may call a referendum on issues ofgeneral national interest, on a bill of an ordinary law, on a bill of anorganic law or decree relating to the signature of an international treaty oragreement which is not inconsistent with the Constitution but has repercussionson functioning of state institutions