Labour’s Wes Streeting announced his resignation as health minister on Thursday, calling for a leadership contest to oust British Prime Minister Keir Starmer, who has shown no sign he is ready to step down. Disastrous results for the governing Labour Party in last week’s local elections have plunged Britain into its latest crisis, just under two years after Starmer won a large majority on a vow to bring stability and end a decade of political chaos. After days of calls by a growing number of...