Days later Oliver Robbins, the prime minister's deputy national security adviser, renewed the threat of legal action. "If you won't return it [the Snowden material] we will have to talk to 'other people' this evening." Asked if Downing Street really intended to close down the Guardian if it did not comply, Robbins confirmed: "I'm saying this." He told the deputy editor, Paul Johnson, the government wanted the material in order to conduct "forensics". This would establish how Snowden had carried out his leak, strengthening the legal case against the Guardian's source. It would also reveal which reporters had examined which files.With the threat of punitive legal action ever present, the only way of protecting the Guardian's team – and of carrying on reporting from another jurisdiction – was for the paper to destroy its own computers. GCHQ officials wanted to inspect the material before destruction, carry out the operation themselves and take the remnants away. The Guardian refused.