Assembly Members are being recalled from their Christmas recess to decide on new council tax benefit rules.
It comes after the Welsh Government failed to pass the proposals in early December.
The Assembly wasn't due to meet again until January - but ministers say a delay in passing the new rules could 'deny vital help' to vulnerable people.
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The Welsh Assembly election is less than a week away and the treatment and care of cancer is one of the more contested issues.
Tributes have been paid to an ambulance driver killed in a crash with another ambulance in North Wales.
Tonight is expected to be clear and dry - though some parts of Wales will experience frost.