Alastair Campbell

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Welcome to a live episode of The Rest Is Politics with me, Alistair Campbell.

And with me, Rory Stewart.

And why are we doing a live episode today, just ahead of the kickoff of the World Cup?

Because, out of the blue...

Breaking news, Defence Secretary John Healey resigned from the Cabinet.

Worse for Keir Starmer, he did so at a time when the Prime Minister is facing a possible leadership challenge in the coming weeks or months, with the likeliest challenger, Andy Burnham, exactly one week away now from the by-election that may see his return to Parliament.

And

Perhaps most devastating of all, John Healy makes clear in his resignation letter that leadership is the issue.

This line, which I suspect hit Keir Starmer quite hard.

You have been unable, writes John Healy, and the Treasury has been unwilling to commit the resources that the nation needs to defend the country.

So he's got Rachel Reeves as well as Keir Starmer in his sights, and he's going down fighting, I guess.

The issue is defence spending, more particularly what's known as the Defence Investment Plan, which he thought had been broadly agreed some time ago, which has been sitting on the Prime Minister's desk amid some very, very tough negotiations.

So we've got a few immediate questions.

Who replaces him?

When does the defence investment plan get published?