What are Sunak’s motives on the NI rise?

Tomorrow is the spring statement. The proposed NI rise set to be outlined in it has been described by the Labour leader Keir Starmer as a 'cynical' move so the Chancellor can cut taxes before the next election for political brownie points. But what are Rishi Sunak's true motives?

Cindy Yu deciphers them with Katy Balls and James Forsyth.