The defence secretary says Sir Keir Starmer's announcement that Labour will back the UK's nuclear deterrent is "not credible". Grant Shapps adds "you can't trust Labour on this" and claims many of the Labour leader's backbenchers are "absolutely against having a nuclear deterrent". Report by Brooksl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn