Keir Starmer is facing a huge threat today after more than 100 Labour MPs joined a Commons revolt against benefits curbs.
Some 108 MPs have signed a 'reasoned' amendment that would effectively kill off the legislation in a Commons vote on July 1.
The scale of the rebellion - reaching into every corner of the party - could be enough to overturn the government's massive majority.
It raises the prospect of Sir Keir being forced into yet another humiliating U-turn - and Rachel Reeves having to find a way of covering the £5billion the reforms are meant to save. Just yesterday Ms Reeves was insisting there will be no major concessions.
Touring broadcast studios this morning, Cabinet Office minister Pat McFadden admitted the insurrection was 'very serious' and stressed there would be 'discussions' with MPs.
