Why was Rachel Reeves crying at PMQs?

There is much we still don’t know or understand about today. Was Rachel Reeves upset by an altercation with the Speaker? Was the issue something more personal? Was she exhausted after the fruitless and demoralising failure of her welfare reform bill? But the sight of the Chancellor at lunch time today fighting back tears at the PM's side was pretty surreal. She looked wounded, fragile and hurt - and inevitably, it’s started speculation she does not have the Prime Minister's full confidence.

The markets are queasy - reflecting a panic that the government is looking less stable. Could the PM be about to sack his own Chancellor? And - how does he reassert his authority for the job he needs to do if the Labour MPs are now directing policy?

We talk to Keir’s former chief of staff Sam White.

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