Yuichiro Tamaki, an ally of Tokyo Governor Yuriko Koike, was elected co-leader of Koike’s Kibo no To (Hope) party on Nov. 10 in a general meeting of the new party’s Diet members of both houses.

Tamaki, 48, a Lower House member, convincingly beat out Lower House member Hiroshi Ogushi, 52, in a one-on-one race with 74 percent of the votes.

Tamaki had gained support prior to the election from the party’s founding members who are close to Koike, as well as young and middle-aged members.

“I want to nurture Hope through extensively accepting like-minded peers so that it will be the party that will be entrusted to lead the government,” the new co-leader said at the morning meeting in Tokyo’s Nagatacho district.

Tamaki won 39 votes to Ogushi’s 14 among all 53 Hope members.

In the race, Ogushi called for cooperation with the Constitutional Democratic Party of Japan and other opposition parties.

During the leadership election race that started on Nov. 8, Tamaki argued that the party should adhere to Koike’s policies. On the controversial issue of constitutional amendment, he said, “Our position is that issues including (war-renouncing) Article 9 should be properly discussed.”

As for the contentious national security legislation, which expands the overseas activities of the Self-Defense Forces, Tamaki virtually approved it, saying the party should “suggest concrete revision proposals for problematic parts, and review them.”

The election brought to light a division between party members over Hope’s basic policies. Some members are worried that those who supported Ogushi in the election might leave the party.

Tamaki, whose term runs until September 2020, is expected to fix the executive lineup early next week, and build a united party to prepare for full-scale discussions at an extraordinary Diet session.