Mendez, the UN special rapporteur on torture, said: "I am deeply disappointed and frustrated by the prevarication of the US government with regard to my attempts to visit Mr Manning."

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Mendez, who has been investigating complaints about his treatment since before Christmas, said the US department of defence would not allow him to make an "official" visit, only a "private" one. An "official" visit would mean he meets Manning without a guard present. A "private" visit means with a guard and anything the prisoner says could be used in the planned court-martial.

Mendez pointed out that his mandate was to conduct unmonitored visits, and that had been the practice in at least 18 countries over the last six years.