Democratic Party of Japan lawmaker Hisayasu Nagata finally revealed Friday what various media sources have already divulged -- that Dumont magazine executive Takashi Nishizawa gave him the fake e-mail suggesting a shady financial link between Livedoor Co. founder Takafumi Horie and a son of Liberal Democratic Party Secretary General Tsutomu Takebe.

Following a session of the House of Representatives Disciplinary Committee, executive committee members met and and voted unanimously to summon Nishizawa for sworn testimony, panel chief Tetsundo Iwakuni said. The date was set for April 4.

During the Disciplinary Committee session, LDP lawmaker Katsuei Hirasawa said Nishizawa's lawyer had told him Nishizawa has denied giving Nagata the e-mail.