Senior LDP member Taku Yamasaki said Wednesday he has not decided what stance he will take if a no-confidence motion is introduced against Prime Minister Yoshiro Mori.

"I have not reached any conclusion. I need to carefully evaluate the timing of the motion and reach a consensus with my colleagues," the former policy chief of the Liberal Democratic Party said, referring to the faction of about 25 members he leads.

The 64-year-old House of Representatives lawmaker on Monday became the first to voice an intention to try to succeed the unpopular prime minister.