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.

Japanese Prime Minister Shigeru Ishiba ’s ruling coalition failed Monday to secure a majority in the 248-seat upper house in a crucial parliamentary election, NHK public television said.

Japan’s ruling coalition lost its upper house majority, dealing a major blow to PM Shigeru Ishiba amid rising public frustration, opposition gains, and looming U.S. trade tariff talks.