Violations of the rights of migrants by state actors at the EU’s external borders, including through the use of pushbacks and indiscriminate violence, both on land and sea, have resulted in NGOs, lawyers and citizen activists engaging in forms of humanitarian action and legal mobilization aimed at contesting inhumane state policies. State actors can similarly rely on various legal tools to create a chilling effect and a hostile environment for migrants’ rights activism. Such practices can be considered to constitute a form of lawfare against migrants’ rights activism, an instrumental and hegemonic use of the law in order to weaken support for migrants. The use of criminal law has been a common tool of lawfare at the European Union’s external borders. However, administrative law is increasingly being used to bring activists into compliance with states’ interests, creating compliant environments through the use of regulatory instruments and administrative sanctions. To critically assess the instrumental use of administrative law as a form of lawfare, it makes sense to review their application at the EU’s external borders. A good opportunity for such a review is being provided by looking at the administrative regulation of search and rescue (SAR) operations in the Mediterranean creating a hostile environment for SAR NGOs in the case of Italy, and the instrumental use of administrative regulations to limit access for activists to the Polish-Belarusian border in the case of Poland.