Jeremy Hunt
Tory MPs have also criticised the prime minister as the backlash against him grows.
Education secretary Gillian Keegan said she could not "guarantee" a promise made by Jeremy Hunt would be met.
The chancellor is planning some Budget sweeteners for voters.
The PM and chancellor have dropped multiple hints that they will reduce tax in the run-up to the general election.
"They're not acting in the national interest, they're acting in party interest," the Labour leader said.
The prime minister has hinted he will cut taxes in the Budget, but voters want investment in public services.
And what does it mean for the government's economic plans?
"There is a giving with one hand, and taking with the other hand," the Money Saving Expert said.
Ed Davey launches New Year bid to "get rid of as many Conservative MPs as possible".
Has the chancellor provided a clue about when the next general election might be?
About Jeremy Hunt
According to his website: "In December 2005 he was appointed Shadow Minister for Disabled People, where he successfully campaigned for the BBC to increase the amount of subtitling on its programmes. He also campaigned strongly for simplification of the benefits system for disabled people and individual social care budgets. In July 2007 he was appointed to the Shadow Cabinet as Shadow Secretary of State for Culture Media and Sport where he has campaigned for more philanthropy for the arts, local TV, superfast broadband, a schools Olympics and a strengthened domestic tourism industry. "In May 2010 Jeremy was appointed Secretary of State for Culture, Olympics, Media and Sport in the new Conservative - Liberal Democrat coalition. In September 2012 he was appointed Secretary of State for Health in the Prime Minister's Cabinet reshuffle. "Jeremy divides his time between Westminster and his constituency home in Farnham. He married his wife Lucia in July 2009 and they have a son and a daughter."