On March 27, 2015 Sassou Nguesso announced that his government would hold a referendum to change the country's 2002 constitution and allow him to run for a third consecutive term in office. On October 25 the government held a referendum to allow Sassou Nguesso to run in the next election. The government claimed that the proposal as approved by 92 percent of voters with 72 percent of eligible voters participating. The opposition, who had boycotted the referendum claimed that the government's statistics were false and that the vote was a sham.

When did Sassou reveal that there would be a vote to alter the 2002 constitution?