Prime Minister Ishiba Shigeru and his Liberal Democratic Party were projected to lose their majority coalition government in Japan's Upper House of Parliament on Monday.

The Yomiuri report comes just hours after U.S. President Donald Trump announced a trade deal with Japan, which will see the Asian economic giant subject to a 15% tariff. Ishiba welcomed the deal, having earlier signaled that he would remain in office at least until a trade agreement with the U.S. was reached.