The Government's spending cuts are not being made for their own sake but are instead based on "values", David Cameron is expected to say.
In speech later, the Prime Minister will say the Coalition's austerity programme is designed to "give people a sense of economic security and peace of mind".
He said that security came from "having more money in our pockets", saying "every efficiency" found could help provide "a bit of extra cash" for hard-pressed families.
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It will be a cloudy and at times damp morning across much of the UK, apart from the far west where it will be dry and bright.
Barack Obama has returned to the political spotlight, campaigning for Democratic candidates ahead of upcoming elections.
The prime minister said there was a "clear and urgent imperative" to give new impetus to stalled negotiations.