Jon Stewart speaks to Jon Snow on Iran and his film “Rosewater”

Ex-Daily Show host Jon Stewart is the writer/director of a new film about the experiences of the film-maker Maziar Bahari, who was detained for almost four months in an Iranian prison.Sign up for Snowmail, your daily preview of what is on Channel 4 News, sent straight to your inbox, here: http://mailing.channel4.com/public/snowmail/remotebox.jsp

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