Good morning. This time yesterday Keir Starmer’s leadership was already in peril, with many in his party assuming that he will be replaced by Andy Burnham at some point later this year, but there was a consensus that, on defence and international security, his record was impressive. John Healey’s surprise resignation as defence secretary blew that apart. Later, after 8pm last night, Al Carns, the armed forces minister, also resigned over the defence investment plan.

Here is our main story, by Pippa Crerar and Dan Sabbagh.

Here is an analysis by Jessica Elgot.

And you can read the exchange of letters between Starmer and Healey here.

In his letter to Healey, Starmer defended the defence investment plan (Dip), which has not been published but which prompted Healey’s resignation because, when he saw what he thought was the final version on Monday, he concluded that it did not commit enough money to the armed forces. Starmer said:

You are also right that we have to go further. The defence investment plan does just that — delivering an unprecedented increase in defence spending in a sustainable way. It will provide the resources our military needs to keep us safe and the clarity the British defence industry needs to plan. It will make the big strategic investments we need for the long term and give the certainty which private finance needs to invest. It will allow our armed forces to transform and modernise and back them with the tools they need to change the way we fight — and to deter our enemies. And crucially it will ensure the money spent is spent wisely and used to back jobs and growth here in Britain.

That implied the version of the Dip that was unacceptable to Healey would not be changed.

But this morning Peter Kyle, the business secretary, has been giving interviews on behalf of the government – and he implied it was still being finalised.

Kyle told Times Radio “the plan is being developed” and “we are determined to get it right”. And on Sky News he said:

We are setting [the Dip] out before the Nato summit, [in] early July, what that looks like, and we are just finalising those plans.

At one point the government was expected to publish the Dip this week. The Nato summit does not start until 7 July, and so Kyle’s comments imply publication has been held back.

In his Times Radio interview, Kyle also rejected a suggestion that the government’s defence policy was “in tatters”. When this was put to him, he replied:

No, the plan is being developed. We are determined to get it right. We are talking about an enormous amount of money going into defence at a period of time where we have to modernise the way we think about defence, but also make sure that we do so in a way that benefits British jobs. This is highly complex.

Last night Dan Jarvis, the former security minister, was appointed defence secretary. We don’t know yet whether, as a condition of taking a job, he insisted on a revision of the Dip spending figures that Healey criticised so strongly. But he is due to attend an event at a drone factory in Swindon this morning, and so we might get some clarification there. Earlier this morning he arrived at Downing Street.

(According to Politico, the visit to the drone factory was planned some time ago, and at one point it was thought this could be where Healey would be announcing the publication of the Dip. But on Wednesday the Commons speaker, Lindsay Hoyle, said that releasing such an important announcement when the Commons was not sitting would be “an utter disgrace and an utter kick in the face” to MPs, and – before Healey resigned – the government abandoned plans for an annoucement today.)

We will also get a lobby briefing at 11.30am which may – or may not – provide some clarity. Otherwise, the political diary for the day looks quite empty.

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