article_snippet.sent: That means we have got to have the least cost deterrent that we can have.'
article_snippet.sent: Earlier this year Mr Miliband had said Mr Miliband favoured the 'least cost deterrent' possible.
article_snippet.sent: Military experts insist four submarines are the minimum needed to ensure Trident can be deployed at sea at all times.
article_snippet.sent: Any fewer would mean that the missiles would on occasion be left vulnerable in port.
article_snippet.sent: Mr Fallon attacked the idea of having only three, saying there was no point in having a deterrent that 'takes the weekend off'.