Japanese Prime Minister Shigeru Ishiba vowed to remain in office on Monday after his ruling coalition suffered a bruising defeat in upper house elections, as the opposition weighed a no-confidence motion.

Prime Minister Ishiba Shigeru and his Liberal Democratic Party were projected to lose their majority coalition government in Japan's Upper House of Parliament on Monday.

Japan’s shaky ruling coalition is likely to lose its majority in the upper house, exit polls showed after Sunday’s election, potentially heralding political turmoil as a tariff deadline with the United States looms.