The Japanese Communist Party would not support Koichi Kato as the nation's leader even if the heavyweight LDP member, who is trying to topple the Cabinet of Prime Minister Yoshiro Mori, revolts from the Liberal Democratic Party, according to JCP leader Tetsuzo Fuwa.

The JCP will not join hands with someone who considers himself a "mainstream" LDP member, Fuwa said in an interview, noting that Kato's political stance would not change just because his party affiliation does.

Fuwa made the remarks in response to the growing likelihood of Kato breaking away from the LDP, in which he leads the second-largest faction.