Appearing on ITV1's Daybreak, he said: "Why is it that one fire service can cost twice as much as another, even though if, per head of population ... it is in a very similar area?
"If those above the average cost just as much as the average, which provide really good fire services, there is £200 million to be saved.
"So it is right that these questions are asked, and that it is answered and debated by the fire and rescue service leaders themselves."
Dave Green of the Fire Brigades Union warned that lives could be lost and reducing the numbers of firefighters would be "completely wrong".
He said the reduction in callouts was due to the preventative work of the fire service, but any cuts could mean preventative work was diminished.
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