Ammon News - Japanese Prime Minister Shigeru Ishiba vowed to remain in office on Monday after his ruling coalition suffered a bruising defeat in upper house elections, prompting some of his own party to deliberate his future as the opposition weighed a no-confidence motion.

The embattled premier told a news conference he would remain in office to oversee tariff talks with the United States and other pressing matters such as rising consumer prices that are straining the world's fourth largest economy.

Analysts say his days may be numbered, having also lost control of the more powerful lower house in elections last year and shedding votes on Sunday to opposition parties pledging to cut taxes and tighten immigration policies.

"The political situation has become fluid and could lead to a leadership change or the reshuffling of the coalition in coming months, but Prime Minister Shigeru Ishiba will likely stay to complete the tariff negotiations with the U.S. for now," said Oxford Economics' lead Japan economist Norihiro Yamaguchi.

Facing a voter backlash over rising consumer prices, investors fear his administration will now be more beholden to opposition parties advocating for tax cuts and welfare spending that the world's most indebted country can ill afford. Reuters