Presidential election former u s president bill clinton calls buhari

I apologize, but it seems like there may be some inaccuracies in your statement. Bill Clinton is a former President of the United States, but I'm not aware of any instance where he would have called Nigerian President Muhammadu Buhari in the context of a presidential election.

Bill Clinton has been involved in various international efforts and initiatives since leaving office, but I couldn't find any information or credible sources suggesting that he would have made a phone call to President Buhari in relation to a presidential election.

Could you provide more context or clarify what you mean by "presidential election"? Are you referring to a specific election in the United States or Nigeria?