(AP) — British Prime Minister Keir Starmer announced Monday that he will resign, forced out by his own party after missteps and mistakes soured voters’ goodwill for a prime minister who won a landslide election victory two years ago.

Starmer, whose promised steady leadership and economic growth, says he will remain caretaker prime minister until his Labour party chooses a new leader — with expectations growing that it will be former Greater Manchester Mayor Andy Burnham.

Burnham confirmed in a social media post that “I will put myself forward as part of this process.” Former Health Secretary Wes Streeting, who was considered his main rival for the top job, said he will back Burnham.