Sri Lanka, June 24 -- British Prime Minister Keir Starmer announced his resignation on Monday, finally bowing to an internal party mutiny.His resignation automatically triggered a leadership contest and the Labour Party is scheduled to open nominations for the leadership on July 9.

Mr. Starmer would serve as caretaker prime minister until the new leader is elected. Having led the Labour Party, once considered unelectable under Jeremy Corbyn, to a near two-thirds majority in the House of Commons barely two years later, Starmer's reversal of political fortune is unprecedented and even cruel.

It could only be explained by the political instability and restless electorate born out of the Brexit referendum. The seventh British prime ministe...