The author outlines his thesis that legal discourse is a special case of general practical discourse (Sonderfallthese) and develops it as an attempt to cover both the authoritative, institutional, or real and free, discursive, or ideal dimension of legal reasoning. On this basis, he examines the objections raised by Habermas (1996) to the special case thesis. First, he discusses the reduction of general practical discourse to moral discourses (genus proximum problem) holding that the former is a combination of moral, ethical, and pragmatic arguments within the priority of just; second, he examines the objection that general practical arguments change their character or nature when employed in legal contexts (subset and specification problem) and the related problems concerning legal validity and unjust law. He concludes proposing a procedural (opposite to a coherential) integration of general practical arguments in the legal context.