The Obama administration has embraced another key argument of former President Bush’s counterterrorism policy. In a court filing on Friday, the Justice Department told a federal judge that prisoners held at the US Air Force base at Bagram in Afghanistan have no legal rights to challenge their imprisonment. Human rights groups say they are becoming increasingly concerned that the use of extra-judicial methods in Afghanistan could be extended under the new US administration. Bagram Air Base is about to undergo a $60 million expansion to provide enough space to house five times as many prisoners as remain at Guantanamo.