Sohei Kamiya, leader of Japan’s populist Sanseitō party, has stormed Japan’s political landscape by winning 14 new seats in the House of Councillors in July 2025. Inspired by President Trump’s America First politics, Kamiya campaigns on nationalism, strict immigration control, and restoring traditional Japanese values.
Kamiya, 47, a former Self‑Defense Forces reservist, English teacher, and supermarket manager, founded Sanseitō in 2020 through YouTube and social media platforms. He calls his message “Japanese First,” echoing Trump’s populist style by emphasizing domestic industry, food sufficiency, and culture over globalism.
Sanseitō’s unexpected gains—rising from one seat to 15 in the 248‑member upper house—represent a major setback for Prime Minister Shigeru Ishiba’s long-governing coalition. Analysts attribute its success to voter frustration with economic stagnation, inflation, and demographic decline.
Sohei Kamiya has openly admired President Trump’s leadership, promoting tougher immigration laws, reduced welfare to foreigners, and opposing gender diversity mandates. Critics accuse him of xenophobic rhetoric and antisemitism, while human rights activists warn of rising intolerance.
Sanseitō draws strong support from younger voters and rural communities disillusioned with establishment parties. Its YouTube channel now attracts nearly half a million subscribers—far exceeding the ruling Liberal Democratic Party—increasing its reach and influence among digital-savvy constituents.
Despite its gains, Sanseitō lacks power to legislate independently. Kamiya has ruled out alliances with traditional parties and focuses instead on building strength for future elections, aiming to reshape Japan’s policy direction through a multiparty coalition model.
