TOKYO — Yuriko Koike will resign as leader of the Party of Hope, sources close to the matter said Tuesday, after the fledgling party formed by the popular Tokyo governor performed poorly in the general election last month.

The move comes as the party is set to reveal its new leadership group later Tuesday under recently-selected co-leader Yuichiro Tamaki, who is a lower house lawmaker.

Koike established her national political party in the run-up to the Oct. 22 House of Representatives election in an effort to defeat long-standing Prime Minister Shinzo Abe and his ruling coalition.

The Party of Hope fielded 235 candidates nationwide but managed to secure just 50 of the 465 seats up for grabs.