Outgoing Liberal Democratic Party leader Shigeru Ishiba announced his resignation on Sunday, triggering a leadership contest expected in early October as the long-governing party confronts internal divisions and a range of foreign and domestic challenges.
The party began jockeying for a successor on Monday, with officials preparing for a race now widely expected on Oct. 4. The leadership vote will determine Japan's next prime minister because the LDP remains the senior party in the governing coalition despite losing its parliamentary dominance in recent elections. Party officials were discussing whether to hold a "full-spec" vote that includes both LDP lawmakers and rank-and-file local representatives, as in the previous contest, or a simplified vote limited to lawmakers; sources said the party was leaning toward the full version.
To qualify, prospective candidates must collect nominations from at least 20 fellow LDP parliamentarians. Toshimitsu Motegi, a centrist and former foreign minister who also served as party secretary-general, was the first to declare a bid on Monday, saying he had decided to run "to devote all of myself to the country." Other likely contenders include Agriculture Minister Shinjiro Koizumi, Chief Cabinet Secretary Yoshimasa Hayashi, and two ultraconservative former economic security ministers, Sanae Takaichi and Takayuki Kobayashi, all of whom competed in last year's leadership race.
Takaichi faces particular obstacles: many of her previous nominees lost their seats in recent elections amid links to corruption scandals, raising questions about her ability to meet the nomination threshold, political analysts said.
Ishiba's resignation followed a historic loss for the LDP in the summer parliamentary elections. He framed his departure as taking responsibility for those results and effectively aborted plans by the party to stage an early leadership vote that would have functioned as a no-confidence referendum on his stewardship. His decision to step aside after roughly a year in office underscores the political uncertainty confronting Tokyo.
The governing coalition no longer commands a majority in both houses of parliament, increasing pressure on the LDP to pick a leader who can build consensus with more centrist opposition parties. Tetsuo Saito, leader of the LDP's junior coalition partner Komeito, signaled that his party could not remain in the coalition unless the next leader is center-right.
Political scientist Masato Kamikubo of Ritsumeikan University in Kyoto said the new leader will need to negotiate with opposition parties on key diplomatic and security issues. "It’s essential for a next prime minister to form a consensus (with the opposition) in dealing with diplomacy, Trump and China," Kamikubo said. "If this can be done, I don’t think Japan’s political outlook is so bleak."
The next LDP leader will inherit a complex agenda. Japan faces mounting geopolitical tensions with an increasingly assertive China, persistent threats from North Korea and heightened friction with Russia. Relations with the United States present additional pressures, as the Trump administration has pushed allies for higher defense spending and purchases of U.S. weapons. Domestic concerns include rising consumer prices, contentious rice policy reforms, an aging and shrinking population, and intensifying debates over immigration policy.
The party also must contend with the electoral gains of new populist groups such as Sanseito, which campaigned on platforms that resonated with voters dissatisfied with traditional politics. That shift complicates the LDP's task of regaining broader public support.
Party officials said they planned to finalize details of the leadership contest this week. The outcome will shape Tokyo's approach to both immediate policy choices and broader strategic alignments at a time of regional and domestic flux.