For the third time in four years, we appear on the brink of a prime minister announcing their plan to leave office, not because they have lost a general election but because their own party has concluded they would be better off without them.
Many people within government and in the wider Labour Party expect Sir Keir Starmer to say just this, perhaps as soon as this morning.
Four years ago, and three prime ministers ago, Boris Johnson was running the country.
He was arguing defiantly he would carry on, but that defiance drained away as it became clear his capacity to viably govern was deserting him.
In early July 2022, I was standing in Downing Street as the lectern appeared and Johnson set out that, despite winning a big majority just a handful of years before, his own MPs were fed up of him and so reluctantly he was standing down.