Edward Snowden has set out the case for Barack Obama granting him a pardon before the US president leaves office in January, arguing that the disclosure of the scale of surveillance by US and British intelligence agencies was not only morally right but had left citizens better off. Speaking on Monday via a video link from Moscow, where he is in exile, Snowden said any evaluation of the consequences of his leak of tens of thousands of National Security Agency and GCHQ documents in 2013 would show clearly that people had benefited. The campaign could receive a further lift from Oliver Stone’s film, Snowden, scheduled for release in the US on Friday. Over the weekend the director said he hoped the film would help shift opinion behind the whistleblower, and added his voice to the plea for a pardon.