In the context of the so-called refugee crisis, political disputes about solidarity become a central issue with member states applying competing concepts. At the same time, European cities use transnational networks to implement a new form of solidarity among municipalities via city diplomacy (Acuto, Morissette, & Tsouros, 2017). Analyzing the deadlock between member states and the emerging activities of cities, we scrutinize the limits of existing approaches to political solidarity (e.g., Agustín & Jørgensen, 2019; Knodt, Tews, & Piefer, 2014; Sangiovanni, 2013) to explain this phenomenon. Based on expert interviews and document analysis from a study on transnational municipal networks, we identify an emerging concept of solidarity that challenges the nation states as core providers of solidarity from within: transmunicipal solidarity focuses on joint action of local governments to scale out and scale up.

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