Pressures on the NHS in Wales mean it could face a funding gap of £2.5bn by 2025/26, according to a report by the Nuffield Trust think tank.
The research suggests the shortfall - the result of 'rising costs' and 'tight' public finances - would occur if funding only rises in line with inflation after 2015/16.
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Crowds came to hear him speak this afternoon in Bangor - a seat where fewer than 100 votes could make the difference at the next election.
Scattered showers with the odd heavy burst possible but there will be plenty of sunny spells too.
A rather wet and windy evening, with rain in the north and showers elsewhere.