The Australian Conservation Foundation (ACF) will file a case with the tribunal as it seeks to access information on at least 15 environmental approvals “fast-tracked” by the federal environment minister, Sussan Ley, a task so far stymied by the government’s insistence the documents fall under traditional cabinet rules. The prime minister, Scott Morrison, has insisted national cabinet deliberations are treated the same as those in the federal cabinet, which are kept confidential and not subject to freedom of information legislation.