Mr Ishiba has been under growing pressure to step down as his ruling Liberal Democratic Party (LDP) and its junior coalition partner, Komeito, lost their majority in the 248-member upper house, the smaller and less powerful of Japan's two-chamber parliament on Sunday, shaking his grip on power and Japan's political stability.

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

Japanese PM Shigeru Ishiba's political future hinges on tariff negotiations following a trade deal announced by Trump. Ishiba plans to assess the agreement's impact before deciding on his position, amid declining support and pressure from his party after recent electoral losses.

President Donald Trump on Sunday escalated his call for the Washington Commanders to change their name back to the “Redskins,” threatening to restrict the NFL team’s stadium deal if they don’t, though it’s unclear how he would be able to.