This deliverable provides an overview of the national policy landscape related to migrant irregularity for 15 countries in the form of Country Briefs. Briefs are provided for the following countries: Austria, Belgium, Canada, Finland, France, Greece, Ireland, Italy, the Netherlands, Poland, Portugal, Spain, Türkiye, the United Kingdom and the United States. The Briefs are drawn from more extensive analysis conducted within MIrreM Country Profiles, which themselves will be analysed comparatively in a subsequent Deliverable (D3.3). The purpose of the Briefs is to provide a concise synopsis of the main policy issues of relevance for the irregular migration situation in each respective country, with a focus on developments since 2010. They are not foreseen to be an exhaustive representation of the entire policy and irregular migration situation in each country, but rather provide a snapshot of the most relevant issues to date, by each national rapporteur's assessment. Each Brief provides a short overview of the recent (since 2010) policies of relevance for irregular migration, in particular the respective country's irregular migration-related policy priorities, stakeholders, recent policy measures, main turning points in policy development, policy impacts, and challenges in implementation. Moreover, each Brief outlines the main types of migrant irregularity that emerge and the pathways into and out of irregularity in each country, including regularisations as relevant. Annexed to this Deliverable is also an overview of the legal and policy frameworks highlighted as relevant for migrant irregularity in each respective country.