Mr Kwankwaso, a former governor of the state, made the declaration on Sunday at the presidential rally of the PDP which held at the Sani Abacha stadium.
Mr Obi, a former Anambra State governor, is the running mate of Atiku Abubakar, the candidate of the PDP for the presidential election next weekend.
Mr Ortom also dismissed the allegation by the senator that he armed livestock guards.
Mr El-rufai made this known on Wednesday while delivering a keynote address at a colloquium in Ibadan, the Oyo State capital.
After the visit, Melaye willingly presented himself to the police for arrest.
Mr Sani, a fierce critic of his state governor, Nasir El-rufai, is seeking re-election on the platform of the Peoples Redemption Party (PRP).
The Senator is said to be wanted for alleged homicide he committed in July.