Grace Mugabe is eyeing the post of her husband, and would like to succeed the oldest serving president in Africa.

Grace told thousands of indigenous church followers at a stadium in Harare that she has spoken to her husband about her desire to take over after him.

"I say to Mr Mugabe you should ... leave me to take over your post," she told the crowd.

"Have no fear. If you want to give me the job give it to me freely."

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Vice President Emmerson Mnangagwa, who had been touted as a possible successor to Mugabe, has recently fallen out with him, meaning Grace stands a chance.

On Saturday, the president threatened to fire Mnangagwa, accusing him of fanning factionalism to garner support ahead of a party special congress due in December.

93-year-old Mugabe has been President of Zimbabwe since 1987, he previously led Zimbabwe as Prime Minister from 1980 to 1987.

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