First minister politics playing, says David Cameron
David Cameron has accused First Minister Carwyn Jones of "playing politics" over the Assembly's powers ahead of next year's elections.
The prime minister denied Mr Jones's claim that the UK government's plans could reduce the assembly's powers.
Mr Cameron said his government agreed to protect Welsh government funding by putting a "floor" under the formula that decides its share of UK spending.
Details of the floor to the Barnett formula are expected next month.
The prime minister said his government had entered "in good faith" into talks to give the assembly further powers.
The UK government is due to publish later this month draft plans to change the way devolution works in an attempt to set out more clearly who runs what.
But Carwyn Jones has suggested the current proposals could lead to a rolling-back of the current settlement.