Immigration law does lag behind in the advancement of public law, but not in all respects. While immigration law is idiosyncratic in many ways, this Article finds immigration law in the administrative law mainstream when it comes to its troubles with nonlegislative rules (sometimes called guidance documents). There are concerns throughout administrative law that agencies use such rules to bind regulated parties practically, even if not legally, without the procedural protections of notice and comment. This Article analyzes immigration troubles with nonlegislative rules and makes three main contributions. First, it casts new light on the negative effects of guidance documents by viewing administrative law through the lens of immigration l...