Jeremy Corbyn isolated over Salisbury spy attack response as John McDonnell says 'highly likely' Moscow responsible

Jeremy Corbyn appeared increasingly isolated over his response to the Salisbury spy attack after John McDonnell, his closest Labour ally, said it was “highly likely” the Kremlin was responsible.

Mr Corbyn has faced fierce criticism from dozens of moderate Labour MPs over his response to the Government’s conclusion that Moscow was responsible for the poisoning of former double agent Sergei Skripal and his daughter, Yulia.

The growing disquiet came as moderate Labour MPs prepared to try to oust Seumas Milne, Mr Corbyn’s head of communications, the Telegraph can disclose.

Theresa May, the Prime Minister, said last Monday it was “highly likely” Russia was responsible and then on Wednesday that there...