Dr Abdullah Abdullah pulled out of the second round of the Afghan presidential election, saying the vote could not be free or fair.
He told Stephen Sackur that he would not join President Hamid Karzai's government.
Watch the full interview with Dr Abdullah on HARDtalk on Wednesday 11 November 2009.
BBC World News: 0430, 0930, 1430, 1830, 2130 GMT.
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