By Jonathan Ugbal The Special Assistant to President Muhammadu Buhari on prosecution, Mr. Okoi Obono-Obla has threatened to slam a NGN5 billion suit on the Deputy President of the Senate, Ike Ekweremadu for defamatory statements. Mr. Ekweremadu had yesterday (Monday) issued a statement accusing Mr. Obla of spearheading a smear campaign against him with the