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His resignation plan comes a day before his Liberal Democratic Party makes a divisive decision on whether to hold an early leadership election, a virtual no-confidence motion against him if approved.

Ishiba intends to step down to prevent the party from getting divided further, NHK said. If he had stayed on, he would have inevitably struggled to manage his divided party and minority government.

The prime minister is expected to hold a news conference later Sunday.

In July, ’s ruling coalition failed to secure a majority in the 248-seat upper house in a crucial parliamentary election, further shaking the stability of his government. The loss added to an earlier election defeat in the lower house, where the party-led coalition also had lost a majority.

His decision came after his meeting Saturday with Agriculture Minister Shinjiro Koizumi and his perceived mentor, former Prime Minister Yoshihide Suga, who apparently suggested Ishiba’s resignation ahead of Monday’s vote.

He had previously insisted on staying, stressing the need to avoid a political vacuum at a time Japan faces big challenges, including U.S. tariffs and their impact on the economy, rising prices, rice policy reforms and growing tension in the region.

Since the LDP’s adoption, last week, of its review of the election loss, which called for �a complete overhaul� of the party, requests for an early leadership vote or for Ishiba’s resignation before Monday’s results have gained traction.

With Ishiba stepping down as party leader, the LDP is expected to set a date for its party presidential election, likely to be held in early October.

Possible candidates include Koizumi, as well as ultra-conservative former Economic Security Minister Sanae Takaichi, Chief Cabinet Secretary Yoshimasa Hayashi, a moderate and the protege of former Prime Minister Fumio Kishida.

Lacking a majority in both houses, the next LDP leader will have to work with the main opposition parties to get bills passed, experts say, or else face constant risks of no-confidence motions.

The opposition parties, however, are too splintered to form a big coalition to topple the government.

In recent weeks, Ishiba successfully got U.S. President Donald Trump to lower the tariff rates the US administration imposed on Japan from 25% to 15%. Ishiba also said he has had his chief trade negotiator, Ryosei Akazawa, deliver his letter to Trump, stating his wish to work with him to create “the golden era� of the Japan-U.S. alliance, inviting the American leader to visit Japan.

Ishiba's top aide, LDP Secretary General Hiroshi Moriyama, a key figure who negotiated with main opposition leaders to help achieve legislation since the prime minister took office, has also expressed his intention to step down on Sept. 2 over the election loss, though Ishiba hasn’t granted him resignation. Moriyama's departure would have dealt a blow to the prime minister.