Japanese voters headed to the polls on Sunday in a tightly contested election amid public frustration over rising prices and the imminent threat of US tariffs. The ruling Liberal Democratic Party (LDP) and its junior coalition partner Komeito need to secure a combined 50 seats to retain an overall majority in the upper house but the latest polling shows they might fall short.

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.