Gwendolen Morgan, of law firm Bindmans, representing Mr Miranda, said outside court that the Home Office and police had made "sweeping and vague assertions about national security".
She said Mr Miranda "does not accept the assertions they have made".
He "looks forward to the opportunity to have the Government's actions and assertions fully scrutinised" at the hearing in October, she added.
More top news
One estimate suggests that higher mortgage repayments could squeeze hard-pressed householders into debt peril.
Calculate your monthly mortgage repayments if interest rates rise.
Fast-melting Arctic sea ice has forced some 35,000 Pacific walruses to retreat to the Alaska shoreline.