Nicolas Sarkozy has announced he will run for French presidency next year, seeking a return to the post he lost to Francois Hollande in 2012.
Mr Sarkozy announced his decision at a meeting with fellow party members on Saturday, and said he would be stepping down as head of Les Republicains to make way for his return bid for presidency.
He will run in France’s 2017 election against 13 others in his party who have already declared their candidacies.
Mr Sarkozy's main competitor is said to be mayor of Bordeaux and former Prime Minister Alain Juppé, who criticised on Saturday the “confusion between Nicolas Sarkozy, president of the party, and Nicolas Sarkozy, candidate campaigning for the primaries”.
Supporters of Les Republicains and other right and centre-right parties will vote in November to decide who will be their candidate in the 2017 presidential election.
The winner will face the far-right National Front’s Marine Le Pen and a Socialist candidate, likely to be François Hollande.
Speaking to members of main opposition party Les Republicains, Mr Sarkozy said: “This national council will be my last one as president of Les Republicains.
“This primary will be a time of competition between some strong personalities, between people of significant talent. When the right goes into battle it has a front on the left and a front on the extreme right. That is why it is unacceptable that we should attack each other.”
Initially Mr Sarkozy, 61, said he had intended to step away from the political leadership, especially given the unpopularity his abrasive style had generated among voters.
Latest opinion polls show, however, that he has overtaken Mr Juppé as the centre right’s preferred presidential candidate.
Mr Hollande is expected to seek another term as president while Marine Le Pen will run for the far right Front National.
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