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In page Mohamed Ghannouchi:

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After the fall of President Zine El Abidine Ben Ali on 14 January 2011 in the wake of the 2010–2011 Tunisian uprising, he was the self-proclaimed acting President of the country for a few hours starting on 14 January 2011,[2][3] under Article 56 of the Constitution of Tunisia.[4][5] He remained Prime Minister for six weeks before stepping down.