Starr News understands Ivory Coast President Alassane Ouattara accompanied Mahama to hold talks with the leadership of the political parties and the sitting president Faure Gnassingbe.
Gnassingbe has taken the lead in results declared so far. Opposition leader Jean-Pierre Fabre's CAP 2015 coalition has been complaining of widespread irregularities and wants the announcement of results to be suspended.
Gnassingbe has been in power since 2005.
In a letter to the electoral commissioner Issoufou Taffa Tabiou, the Coalition said the initial figures produced by the election commission did not match the results CAP 2015 members had recorded at polling stations.