David Cameron claimed Labour was "heading for a winter crisis" after suggesting the party had moved to the left since Jeremy Corbyn took charge.
In response to a question from Labour's leader on the state of the NHS as winter approaches, the Prime Minister responded by taking a swipe at some of Mr Corbyn's appointments.
"It is the Labour party that’s heading for a winter crisis", Mr Cameron said.
"Look at his appointments. His media advisor is a Stalinist, his new policy advisor is a Trotskyist and his economic advisor is a communist.
"If he’s trying to move the Labour party to the left I’d give him full marks."
It is believed that the Prime Minister was referring to Seamus Milne, Andrew Fisher and Thomas Piketty respectively.
Beforehand Mr Cameron insisted that the NHS had sufficient resources for the coming months, saying: "I believe the NHS has the resources that it needs and that's why we are seeing it treating more patients, with more treatments, more drugs being delivered, more tests being carried out."
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