Prime Minister Shigeru Ishiba announced Sunday that he will resign amid growing calls from within the Liberal Democratic Party for him to take responsibility for a pair of poor showings at the polls, putting an end to his 11-month tenure.

In a news conference Sunday evening, Ishiba said he decided to step down because tariff negotiations with the United States, an issue he has described as a "national crisis," reached a milestone on Friday.

"I've always said I will decided what to do in an appropriate timing. With U.S. tariffs negotiation reaching a certain phase, I believe now is the appropriate timing," Ishiba said. "I decided to give way to the next generation."