The 91,110 members of the Republicans could begin to vote, Saturday at 6 p.m., for the first round of the election of the new president of the right-wing party.
The vote, electronic, must decide between the deputies Éric Ciotti and Aurélien Pradié and the boss of the senators Bruno Retailleau.
It will continue until Sunday at 6 p.m.
The results should be announced immediately.
The three candidates are expected to move to party headquarters after the announcement.
Saturday at 8 p.m., two hours after the opening of the vote, the participation in the ballot was already 24%, according to the party.
In the absence of a poll, predictions are difficult, even if Éric Ciotti, finalist in the 2021 primary, is the favorite.
He received the support of Laurent Wauquiez, president of the Auvergne-Rhône-Alpes region and former party boss.
Read alsoWhat does the geography of Republican members reveal?
Bruno Retailleau, curator from Philippe de Villiers' Movement for France, has a long list of supporters.
As for Aurélien Pradié, younger than his two competitors, and with a social fiber, he will have the status of outsider.
The new president, who will succeed Christian Jacob, will have the difficult task of redressing the party, caught between the macronie and the National Rally.
The right remains on the scathing failure of its presidential candidate Valérie Pécresse (4.8%).