This article examines the Canada-United States Safe Third Country Agreement (STCA) in relation to a growing literature on bureaucrats’ role in immigration policy making, while challenging interpretations of the agreement as a “Europeanization” of Canadian policy. Canada is a prototypical liberal “migration state” that balances economic considerations, national security, rights and broader cultural concerns through its immigration regime. We open the “black box” of the state to examine how bureaucratic decision making informed the development of Canada’s asylum system. Drawing on interviews, archival materials and government documents, we show bureaucrats simultaneously sought to manage asylum backlogs and ensure compliance with international obligations while countering advocacy group opposition. The STCA reflects a uniquely Canadian approach to balancing competing imperatives in refugee policy, highlighting the role of bureaucrats in shaping immigration policy within domestic and international constraints. This research contributes to understanding the historical development of migration control policies in liberal democracies.