Why is Labour sick of the benefit PIP?

The government is due on Tuesday to set out its plans to make cuts to the welfare system. One of the benefits targeted for £5bn worth of savings is the key disability benefit - Personal Independence Payments (PIP).     Health Secretary Wes Streeting has told Sky News 1,000 people a day apply for PIP, but pressure from Labour's backbenchers could see plans to reform the benefit watered down.     On today's Sky News Daily, Niall Paterson speaks to Paul Morrison, a benefits expert and policy adviser for the Methodist Church, on how PIP works and who is eligible. Political correspondent Liz Bates explains the challenges of reforming PIP.  Podcast producers: Natalie Ktena & Rosie Gillott Editor: Wendy Parker