Dr Fox said during a defence debate in the House of Commons that the Government had committed to maintaining Britain's nuclear deterrent but that the renewal of Trident should be scrutinised to ensure value for money.
Dr Fox said the value for money review would be completed by the end of July and the findings would go to the Cabinet Office and be considered by the National Security Council.
The council's conclusions will ‘inform' both the Strategic Defence and Security Review and the cross-Whitehall Comprehensive Spending Review which will be published in the UK autumn.