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

This means that Ishiba no longer has easy control over the upper or lower houses of parliament; last October, the LDP lost control of the more powerful lower chamber, marking a major upset for a party that has ruled Japan for most of its post-World War II history.

The yen climbed across the board on Monday after beleaguered Japanese Prime Minister Shigeru Ishiba vowed to hang on as leader even though his ruling coalition lost its majority in Sunday's upper house elections,