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Allowing her -- and indeed other terrorists -- back into the U.K. to pursue an appeal would create a national security risk that cannot be fully mitigated, even with the diversion of significant resources, he added. Begums bid to reclaim her citizenship initiallywasstruck down by an immigration court in February. The Special Immigration Appeals Commission, which hears national security cases, said she could instead turn to Bangladesh for citizenship. Yet her lawyer argued that Begum -- who is of British-Bangladeshi heritage was not considered a national of Bangladesh and was therefore rendered stateless by the deprivation decision.