The brother of Iran’s moderate president, Hassan Rouhani, has been arrested amid escalating tensions between the government and the country’s hardline judiciary ahead of his swearing-in ceremony next month.

Hossein Fereidoun, a top presidential aide who played a senior role in more than two years of high-level negotiations between Iran and the west over Tehran’s nuclear programme, was taken to prison after failing to secure bail on Saturday, local agencies reported.

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