"We have quite a number of other leaders who have come… in fact, once you have joined APC, all your sins are forgiven.”
Atiku Abubakar, presidential candidate of the Peoples Democratic Party (PDP), has arrived in the United States of America.
The violence is believed to have started when a police officer, trying to maintain peace, shot one of the participants. The victim reportedly died.
Mr Gbadamosi, who was a member of PDP before defecting to the ADP, received rave reviews of his performance in the debate.
The campaign is being moderated by Dino Melaye, the senator representing Kogi west senatorial district.
The Senate Leader, Ahmed Lawan, formally made the announcement on the floor of the Senate on Wednesday.
The former governor of Lagos State said he believes it is not possible for Nigerians to return the PDP to power.
They refused to disclose what was discussed with the president.