Is Angela Rayner unsackable?

The row over Angela Rayner's tax affairs has deepened today. This morning, Greater Manchester police have announced that – following a reassessment of the case – they will open a formal investigation into Angela Rayner. What does this mean for Keir Starmer? And why would it be so difficult for him to sack her? 

James Heale speaks to Katy Balls and Fraser Nelson. 

Produced by Oscar Edmondson.