Campaigners have been lobbying against the BBC's plans for 6 Music
Gordon Brown has added his weight to the campaign to save BBC 6 Music, saying the radio station's demise could lead to a "next stage" of closures.
The Prime Minister told the Radio Times: "I think the BBC should not have succumbed to pressure to cut certain things - but they have."
Mr Brown added that politicians should not determine the corporation's future.
The Tories welcomed news of BBC cuts when announced in March but the Lib Dems questioned the 6 Music decision.
However, neither party commented on Mr Brown's comments, which were published on Tuesday.
Shadow culture minister Ed Vaizey, meanwhile, revealed in an e-mail to a member of the public last month that he had become a fan of 6 Music since its proposed closure was outlined.
"I now know it is brilliant with a passionate and articulate fan base - I am now an avid listener to 6 Music. I suspect that 6 Music has doubled its audience. I strongly suspect 6 Music will be saved," he said.
But Mr Vaizey reiterated that the ultimate decision lay with the BBC Trust.
The Liberal Democrats also earlier endorsed the planned cuts, with culture spokesman Don Foster saying these "signalled the end of the BBC roaming wherever it fancied".
But he added: "I am not convinced that using 6 Music and the Asian Network as sacrificial lambs to pay for it is the right approach."
Mr Foster said BBC licence fee payers should have a say in which services would be cut.
Elsewhere in his interview, the Prime Minister revealed that he was a fan of hit musical series Glee, calling it "brilliant".
He also praised the "amazing talent" of singer Amy Winehouse and said that the award-winning film Hotel Rwanda had made him cry.