Sir Keir Starmer says his support for the nuclear deterrent and to NATO is "absolutely unshakeable". When asked if he would ever consider pushing the nuclear button if he were to become prime minister, the Labour leader adds the nuclear deterrent is "absolutely vital" for the country's defence. Report by Brooksl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn