Ali Akbar Salehi, the head of Iran's nuclear programme, tells Al Jazeera that it is Iran's right to refine uranium to whatever level it needs.<br /><br />Saying that his scientists have the potential to enrich uranium to weapons-grade levels, he warns Barack Obama, the US president, not to test Iran, saying there could be unimaginable consequences if he takes "any wrong step".<br /><br />Nazanine Moshiri has the interview. (12 Feb 2010)
