A political party affiliated with Akbar Hashemi-Rafsanjani, the former president and key member of the Iranian regime, on Sunday called on Mir-Hossein Moussavi, the opposition leader, to form a “political bloc” that would pursue a long-term campaign to undermine the “illegitimate” government.

Hossein Marashi, spokesman for the Kargozaran, stayed clear of directly challenging the supreme leader, Ayatollah Ali Khamenei, but told the Financial Times in a telephone interview that Mr Moussavi was now the leader of an opposition that was not without options.