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Leading Zimbabwean opposition politician Nelson Chamisa has come under fire on Twitter after a video emerged of him saying that if he President Emmerson Mnangagwa wins 5% of the vote "in a free election, I will give him my sister".

"I'm betting on this because I know it won't happen," the Bulawayo 24 news site quotes him as saying in Shona.

There was laughter from the crowd when Mr Chamisa - who hopes to run for the presidency for the first time in elections expected in July - made the comment.

It is unclear where or when he was speaking.

Mr Chamisa sees himself as Morgan Tsvangirai's successor following the veteran MDC leader's death in February, but he is being challenged for the leadership by Thokozani Khupe.

She was Mr Tsvangrai's deputy in the party, and served as deputy prime minister from 2009 and 2013 in the unity government that the MDC formed with the ruling Zanu-PF party to end conflict in Zimbabwe.

Mr Chamisa's comments have led to many people on Twitter accusing him of being sexist.