U.K. Prime Minister Keir Starmer resigned on Monday, paving the way for Britain to have its seventh prime minister in just over a decade.

He said he was stepping down as leader of the governing Labour Party but would remain caretaker prime minister until a new head is chosen by the party.

Andy Burnham, who won a special parliamentary election last week, confirmed that he will run to succeed Starmer.

Starmer won a landslide victory in the 2024 general election, but a series of missteps badly damaged his credibility.

His resignation comes the day before Britain marks the 10th anniversary of its vote to leave the European Union, a decision that still roils the country’s economy and politics.