A constitutional referendum was held in Niger on 4 August 2009. The referendum proposed the dissolution of the Fifth Republic and the creation of the Sixth Republic under a fully presidential system of government, offering a yes or no vote on the suspension of the constitution and granting President Mamadou Tandja a three-year interim government, during which the constitution of the Sixth Republic would be formulated. On 20 June, the Constitutional Court declared the plan illegal, but Tandja subsequently assumed emergency powers and dissolved the Court. The events surrounding this election led to a constitutional crisis.
Although the opposition boycotted the referendum, official results reported that turnout was 68%, with 92.5% of voters in favor. The new constitution was accordingly promulgated on 18 August 2009.
The full details of the referendum proposal were not finalized, but elements of the proposed constitution were outlined by government spokesmen and by a commission set up by the president to draft a proposed document. Tandja would extend his term for a transitional mandate of three years, during which a new constitution would be written and approved. The system of government would be changed from a semi-presidential system to a full presidential system, which Tandja claims is more stable. There would be no limit to presidential terms, and a bi-cameral legislature would be created with an upper house, the Senate.
On 5 June, the President and the Council of Ministers of Niger approved plans for the referendum, titled Referendum on the Project of the VIth Republic. Campaigning would take place from 13 July 2009 to 2 August 2009. The President established a commission to create a draft constitutional law upon which the population would vote. The Independent National Electoral Commission (CENI) was ordered to oversee preparations for voting. Electors would be able to choose "yes" or "no" to the text "Do you approve of the Constitutional project submitted for your assent?"