The office of South Africa's President Jacob Zuma has tweeted that Nelson Mandela is "in good spirits".
The Presidency wishes to advise that former President Nelson Mandela is in good spirits http://t.co/TQKVJzlAxe
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The former reality TV star will follow in the footsteps of Abraham Lincoln and John F Kennedy when he takes his oath later on Friday.
The President-elect's comments on Twitter will come under even closer scrutiny when he takes office on Friday.
Cold, quiet and calm