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Sir Keir Starmer will investigate briefings that unleashed a leadership row as he faces pressure to overhaul his “toxic” Downing Street operation.

The Prime Minister apologised to Health Secretary Wes Streeting for anonymous attacks from No 10 that he was plotting a coup.

Mr Streeting said the “self-defeating” claims – which he denied – showed problems with the culture in Sir Keir’s administration.

Downing Street chief of staff, Morgan McSweeney (Jonathan Brady/PA) PA Archive

The future of Morgan McSweeney, Sir Keir’s long-time ally and chief of staff, at the top

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