PARIS—France's opposition Socialists says former party head Francois Hollande came in first in round one of the party's presidential primary, with 39 percent of the vote.
The party's current leader, Martine Aubry, came in second, with 31 percent of the vote, followed by Arnaud Montebourg, a hard-left legislator who garnered 17 percent.
Speaking on France-2 television Monday, Montebourg said he could throw his support behind Hollande or Aubry later this week. The two are to face off in a televised debate Wednesday ahead of the Oct. 16 runoff.
Three other candidates split the remaining votes, the party announced Monday.
More than 2,486,000 people turned out for Sunday's primaries -- the first such exercise by France's Socialists.