Ousmane was elected as the president of the Interparliamentary Committee of the
West African Economic and Monetary Union on 9 March 2003, at its 12th session, and he was re-elected to that post at the 13th session in March 2004. He was also elected as the president of the Committee on the Human Rights of Parliamentarians of the
Inter-Parliamentary Union (IPU) on 15 January 2004. He took third place in the
November 2004 presidential election, receiving 17.4% of the vote. Objecting to Tandja's efforts to call a referendum on a constitutional change that could allow him to continue as president, the CDS left the government in June 2009. Ousmane stressed that the CDS wanted the constitution to be respected and that Tandja "must submit himself to the decision of the Constitutional Court", which had ruled against the referendum. In opposition, the CDS participated in an opposition boycott of the
August 2009 constitutional referendum as well as the
October 2009 parliamentary election. With the hostility between the opposition and the Tandja government deepening, the authorities issued a warrant for Ousmane's arrest; they also issued arrest warrants for PNDS President Mahamadou Issoufou and former Prime Minister Hama Amadou. Ousmane was living outside of Niger by that point. Following talks with officials from the
European Union on 8 December 2009, Prime Minister
Ali Badjo Gamatie announced that the arrest warrants were suspended to facilitate dialogue with the opposition. Ousmane said on 10 December that the move was encouraging, but that it was also necessary for the government to release those who he characterized as political prisoners. However, the arrest warrants were reactivated two weeks later, diminishing hopes for further dialogue. The government warned that Ousmane and the other opposition leaders would face arrest if they entered Niger. Tandja was ousted in a
military coup on 18 February 2010. That made it possible for Ousmane to return to Niger without being arrested, and he "arrived discreetly" on a flight from
Abuja on 24 March 2010. Ousmane was again chosen as the CDS presidential candidate for the
February 2011 elections. He was unsuccessful in returning to the presidency again; this time coming in fourth place with 8.2% of the vote. In the
2016 presidential election, Ousmane again came fourth with 6.2% of the vote. In the
2020–21 election, he advanced to a runoff but lost to
Mohamed Bazoum with 44.3% of the vote. ==See also==