This Element discusses institutional cooperation in populist foreign policy and its implications for the Liberal International Order.
1. Introduction; 2. The international dimension of populism; 3. Framework; 4. Viktor Orbán; 5. Hugo Chávez; 6. Rodrigo Duterte; 7. Comparison: identifying a populist script of regional cooperation; 8. Implications for research on the contestation of the LIO; 9. Conclusion; References.