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.

Japan's ruling coalition has lost its majority in the country's upper house, but Prime Minister Shigeru Ishiba has said he has no plans to quit.

The embattled prime minister said he would remain in office to oversee tariff talks with the United States and other pressing matters.

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.

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.

Shigeru Ishiba of the long-governing Liberal Democratic Party could face calls to resign if his party fares poorly in Sunday’s Upper House elections.

Japan's ruling coalition lost control of the upper house in an election on Sunday, further weakening Prime Minister Shigeru Ishiba's grip on power even as he vowed to remain party leader, citing a looming tariff deadline with the United States.