This study examines perceptions of threats and the actors in the Swedish Nato-debate. The particular sequence of debate which is investigated took place in Swedish media during the summer of 2015. The objects examined in this study are the actors involved in the debate and the perceptions of threats formed by these actors. Lack of knowledge regarding how debates are formed by actors, through their perceptions of threats, makes us unable to fully comprehend how and why these perceptions are formed. This lack of knowledge makes us unable to evaluate the debate beyond the claims of the participating actors. This study seeks to explain how perceptions of threats in the chosen debate-sequence were formed through filtration. Theory considering filtration of perceived threats states that the actors forming perceived threats does this through psychological-, bureaucratic-, political- and medial processes. Actors and their perceived threats can also exercise power. Whether the actors and their discourses have exercised power in the Swedish Nato-debate is examined through a relational- and productive power perspective. Results show that the participating actors examined, scientists, journalists and politicians, have all formed perceived threats through different forms of filtration, and all actors have in some way exercised relational or productive power in the debate.