Japanese premier Shigeru Ishiba vowed to stay on after his ruling coalition suffered a bruising defeat in upper house elections on Sunday as some of his own party discussed his future and the opposition weighed a no-confidence motion.

The LDP lost its majority in the lower house when Ishiba called a snap general election last October. The LDP has not been in a minority position in both houses simultaneously since its foundation in 1955.

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