UK politics is facing another moment of intense scrutiny as Prime Minister Keir Starmer’s chief of staff, Morgan McSweeney, steps down amid growing attention surrounding the Mandelson-Epstein controversy.

Morgan McSweeney has resigned as Keir Starmer’s Chief of Staff after accepting “full responsibility” for advising on the appointment of Lord Mandelson.

The Prime Minister’s ally had faced calls from within the Labour Party to go after being blamed by many for pushing the appointment of his ally Lord Mandelson as ambassador to the US, despite knowing that his dealings with Jeffrey Epstein continued after the financier’s conviction for child sex offences.

The news will come as a blow to Sir Keir, whose own political future has been thrown into jeopardy amid questions of his judgment in picking Lord Mandelson as his top diplomat in Washington.

In a statement, Mr McSweeney said: “After careful reflection, I have decided to resign from the government. The decision to appoint Peter Mandelson was wrong.”

Morgan McSweeney

Mr McSweeney continued: “He has damaged our party, our country and trust in politics itself. When asked, I advised the Prime Minister to make that appointment and I take full responsibility for that advice.In public life, responsibility must be owned when it matters most, not just when it is most convenient. In the circumstances, the only honourable course is to step aside.”

Reacting to the move, the Prime Minister thanked Morgan McSweeney for “his dedication, loyalty and leadership”.

“It’s been an honour working with Morgan McSweeney for many years. He turned our party around after one of its worst ever defeats and played a central role running our election campaign.

“It is largely thanks to his dedication, loyalty and leadership that we won a landslide majority and have the chance to change the country.