Gen. Flynn’s security clearance was suspended after President Trump asked for his resignation as National Security Advisor, a US defense official confirmed to BuzzFeed News
Flynn, as former Defense Intelligence Agency director, had access to clearance as a customary practice so that future directors could consult their predecessors if needed. Therefore the DIA sponsored his clearance.
His access to that clearance was suspended by the DIA, pending a review — though it is not clear what the DIA is reviewing.