Gordon backing radio station fight; ballotbox briefing.
The digital station is facing closure as part of a shake-up of the corporation, which will divert an extra pounds 600 million into programme-making.
But the Prime Minister said the BBC should not have "succumbed to pressure" to axe some of its output.
He said: "I don't think politicians should make that decision about what the BBC produces. I think the BBC should make that decision.