Sanseito, a Japanese populist party that draws inspiration from Donald Trump's politics, is gaining support ahead of Sunday's upper house elections, suggesting a notable shift in the country's traditionally centrist landscape.

Japan’s ruling party faces major setbacks as Trump’s tariff deadline approaches, threatening the economy and trade relations. Learn what’s next for Japan amid rising tensions.

Japan's upper house election on Sunday dealt a big blow to the ruling coalition and sets markets up for possible policy paralysis and a bigger fiscal deficit, much of which is already priced in, analysts said.