David Cameron will insist he is "sticking to the plan" on the economy as his Business Secretary appeared to suggest it was time to change course.
Despite a turbulent few weeks that has seen the Government left embarrassed after its economic policy failed to deliver on the promise to protect Britain's credit rating and a by-election drubbing that heaped humiliation on Conservatives, the Prime Minister will defiantly pledge to "hold firm".
But Lib Dem Vince Cable appeared to join critics calling for a Plan B to help kick-start growth.
In a move that is likely to fuel speculation of a rift within the coalition on the Government's key economic policy he suggested capital spending, funded by borrowing, may be needed.
Mr Cameron will argue, however, that those who "falter" would plunge the United Kingdom "back into the abyss" just at a time when there were signs the Government's plan was starting to work.