Kokumin Shinto (People's New Party) will cooperate with another new party in the Sept. 11 general election and oppose Prime Minister Junichiro Koizumi's postal privatization drive, leader Tamisuke Watanuki said.

The former Lower House speaker left Koizumi's Liberal Democratic Party after the LDP refused to place him on its ticket because he was among 37 party members who voted against the government-sponsored postal privatization bills in the House of Representatives last month.

"(I) think New Party Nippon is targeting (seats in) constituencies in big cities," Watanuki said in an interview about the other new force of like-minded LDP rebels.