Critics of a possible transfer of Taliban prisoners are discussing tactics to block it, even before the Obama administration appears to have made a final decision on the most politically contentious element of its bid to broker an Afghan peace deal.

Administration officials have, under strict conditions of secrecy, briefed senior lawmakers dealing with military, foreign policy and intelligence issues about the proposal that would move five senior Taliban detainees at the Guantanamo Bay military prison in Cuba to Afghan custody.

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