John Woodcock, a former Labour MP who is standing down at the general election, told The Sun that Mr Corbyn represented a 'danger to Britain'.
He said: 'Labour's lifelong CND-supporting leader gives the game away on Trident every time he opens his mouth.
'It is absurd to suggest that a Jeremy Corbyn-led government would continue investing in the nuclear deterrent.'
He added: 'He would leave the UK and its Nato allies at the mercy of nuclear blackmail from Putin.'
Mr Corbyn also yesterday failed to give his full backing to Nato, prompting former Labour MP Mike Gapes to tweet: 'Once again Corbyn fails to support Nato. He is not fit to be Prime Minister.' Mail.
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