The Labour leader Ed Miliband has said it "beggars belief" that the culture secretary is still in his job.
Interviewed by the Today programme's Evan Davis, he cast doubt on the idea that Jeremy Hunt's special adviser, who resigned on Wednesday over contact with News Corporation during a takeover bid, "acted as a lone wolf".
"Politicians should act in a way that is above board and correct," Mr Miliband added. Mr Hunt has said he "strictly followed due process" over the bid for BSkyB.
But Mr Miliband suggested that the culture secretary's career was being salvaged to keep a "firewall" up around Prime Minister David Cameron.
"If he goes the questions will move to David Cameron's conversations with Rebekah Brooks, with James Murdoch, and others," he explained.
In a wide-ranging interview Mr Miliband laid out his party's policies ahead of next week's local elections. He said the economy was working only for "a few people the top" and promised to introduce changes to bring down energy bills and executive pay.
"We have to do a whole series of things to change the way our economy works," he said.
"It's about how you create productive wealth in this country and how you have a much broader-based economy, not just reliant on financial services; how you stand up to vested interests. And we're talking in this local election campaign about how we stand up to the energy companies, the train companies, how we make different decisions on taxation and how we have fair rewards."
Get in touch with Today via
or text us on 84844.