Keir Starmer has resigned as the leader of the Labour Party, stating he will remain in his post until a successor is selected. The decision follows significant electoral defeats in elections for the Welsh and Scottish parliaments, as well as local councils across England.

The election results were described as devastating by Labour MPs and have intensified pressure on Starmer's leadership, which had been a subject of concern amid declining poll ratings. The loss has also triggered resignations from other prominent figures within the party, including Wes Streeting, who stepped down as health secretary.

Further challenges to Starmer's authority had emerged earlier in the month when Labour stalwart John Healey resigned as defense secretary amidst internal disagreements over defense spending. These events, coupled with the election outcomes, eroded Starmer's standing within the parliamentary party.

The situation was complicated by the ambitions of Greater Manchester Mayor Andy Burnham. An ally of Burnham, who had previously held a seat as MP for Makerfield, resigned from Parliament, creating an opening for Burnham to return to Westminster and potentially vie for the Labour leadership. Starmer had previously blocked Burnham from contesting a by-election in February, but the widespread calls for Starmer's resignation following the recent election results meant he lacked the authority to prevent Burnham's return.

Burnham's successful bid for the Makerfield seat, where he reportedly increased Labour's majority over the Reform UK party, has further bolstered his support among MPs. While Starmer initially indicated he would contest any leadership challenge, he ultimately concluded that he did not command sufficient support within the parliamentary Labour Party to sustain such a bid. He will continue to serve as Prime Minister during the leadership transition period.