David Cameron is set to attempt to calm Conservative nerves with a major speech on the economy on Thursday.
Downing Street aides said it will aim to drive home the Prime Minister's message on the need to stick to the course on economic policy.
Ministers have been voicing their opposition to any potential cuts to their departmental spending ahead of the Budget later this month.
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Ursula Keogh, 11, went missing on Monday around 3.30pm. She was dressed in her school uniform.
"My sincerest apologies to everyone who purchased tickets and were planning to come to the upcoming shows."
His comments at the Defence and Security Forum on Monday came after a £20 billion black hole in the budget for the next decade emerged.