An emerging nationalist Japanese political party whose co-leader outraged many with remarks about Japan's wartime and modern sexual services has expelled a lawmaker for accusing ethnic Koreans of involvement in prostitution.

The Japan Restoration Party on Friday urged the lawmaker, Shingo Nishimura, to retract his comments suggesting many ethnic Koreans are engaged in prostitution in Japan. Nishimura withdrew his remarks, but the party expelled him anyway.

Osaka Mayor Toru Hashimoto, a founder and co-leader of the party, angered Japan's neighbors by saying this week that the Japanese military's wartime practice of forcing Asian women into prostitution was necessary. He also angered the U.S. by suggesting that American troops based in southern Japan should patronize legal adult entertainment establishments to reduce sex crime there.