This article examines the role of trust in the age of mediatised politics. Authority, we suggest, can be successfully enacted despite the disrupted nature of the public sphere if both rational and moral trust are utilised to formulate validity claims. Drawing from Maarten A. Hajer's theorisation of authority in contemporary politics, we develop a model of how political actors and institutions as well as the media employ both rational and moral trust performances to generate authority. Analysing a Finnish case of controversial investigative journalism on defence intelligence, we show how the media in network governance need to critically evaluate the authority performances of political actors while at the same time enacting their own authority performances to retain their position within the governing network and to manufacture trust among networked publics. This volatile position can lead to situations where the media compete for authority with traditional political institutions.