Former News of the World deputy editor Neil Wallis said he is "glad" that Rupert Murdoch "stood by his staff" after hearing secret audio recordings made during a News Corp meeting.
Phone-hacking charges against Mr Wallis were dropped in February this year.
He also replied to a Twitter user who asked whether he thought Murdoch was "really backing the staff":
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The Labour leader did not say whether he would maintain Britain's nuclear deterrent programme.
Ukip leader Paul Nuttall also said he would want to get rid of Sharia courts.
Over 40,000 people picked up their packs to take part in the annual marathon in the capital.