Does the platforming of far-right actors on media outlets radicalize audiences, and if yes, are legitimization effects stronger if the actors’ views go unchallenged by the interviewer and if the media outlet is mainstream? Our study on media platforming exploits the real-life broadcasting of two recent interviews with similar far-right activists on mainstream media platforms in Australia and the United Kingdom. We test via two survey experiments if randomly exposing subjects to the audios of the interviews legitimizes the activists’ views and their image, and whether the type of platform on which the interviews are broadcast, mainstream TV channels or a YouTube channel, affects the effectiveness of the far-right message. In the UK case, we also randomly assign whether the far right-activist is challenged by the journalist to test whether critical interviewing exposes and de-legitimizes far-right views. We expect to find that unchallenged exposure to far-right actors and content on mainstream media contributes to the normalization of these views in the electorate. This study has implications for our understanding of the media's role in popularizing far-right views.