Democratic Party of Japan kingpin Ichiro Ozawa may run in the ruling party's presidential election next month, sources said Thursday.

The intraparty group led by former Prime Minister Yukio Hatoyama held a seminar in Karuizawa, Nagano Prefecture. Ozawa, known for being critical of how the government is run by current DPJ President and Prime Minister Naoto Kan, joined the seminar, adding to the factional maneuvering within the party ahead of the Sept. 14 election.

Ozawa asked the seminar's participants to "join forces and try to live up to the people's expectations." But he didn't mention the DPJ election or his possible candidacy.