The fringe far-right Sanseito party emerged as one of the biggest winners in Japan's upper house election, gaining support with warnings of a "silent invasion" of immigrants.

Japanese Prime Minister Shigeru Ishiba said Monday he will stay in office to tackle challenges such as rising prices and high U.S. tariffs after a weekend election defeat left his coalition with a minority in both parliamentary chambers and triggered calls for his resignation.

Japan’s Liberal Democratic party, the political bloc that has governed the country almost exclusively for 70 years, has lost its majority in both houses of parliament for the first time. The LDP and its coalition partner,