Kalu, who is the Senate Chief Whip, said his problem with Obasanjo started after he helped Tinubu win his re-election in 2003.
The All Progressives Congress, APC, chieftain disclosed that he stepped in to help Tinubu who was lagging behind in 2003.
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Appearing on Silverbird Television on Friday, Kalu insisted that they are both not a threat to each others ambition.
He noted that they are very close friends, with their friendship deep-rooted.
According to Kalu: “So we are like a family and politics cannot separate us. In 2003 when Tinubu was seeking re-election and I saw that he was lagging behind, I assisted him and it’s part of what caused my problem with former President Obasanjo.
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“So we’re a family and we cannot quarrel because of politics. He might have his idea on how to do it and I might have my own idea on how to do it.
“But all I know is that if we meet at Eagle Square, I will give a very good account of myself.”
Both Tinubu and Kalu have declared interest in the presidential ticket of the APC.