Prime Minister Keir Starmer¡¯s political problems have likely grown too big to solve with a single speech. For now, he will try to forestall an immediate challenge to his job.

Starmer will make a last-ditch effort to save his premiership on Monday with a politically charged address designed to hold back calls for a change in leadership atop Britain¡¯s governing Labour Party. Several would-be contenders are sitting on the sidelines, weighing whether to join a scramble for the prime minister¡¯s job as soon as the premier stops talking.

The speech in the wake of Labour¡¯s sweeping defeat in local elections on Thursday, including a historic loss of control in the Welsh parliament, is easily the most consequential event of Starmer¡¯s political career. In it, he will lay out a plan to turn the governing party¡¯s fortunes around, including a commitment to take the U.K. closer to the European Union a decade after the Brexit vote.