Kazuo Kitagawa, chairman of New Komeito's Policy Research Council, remained cautious Sunday about submitting a bill to the Diet on a national referendum for revising the Constitution.

Appearing on a TV Asahi program, Kitagawa suggested that while he is not opposed to the compilation of such a bill, he remains cautious about submitting it during the current legislative session, saying, "We are still discussing details of the bill, and when we should submit the bill is another matter."

The Liberal Democratic Party, New Komeito's coalition partner, is eager to submit the bill this session.