While speaking at the home of All Progressives Congress (APC) chieftain, Dr. Sam Onyishi, during the weekend, Dr Kalu said the president should expect a better return than the 5% he got from the region during the 2015 presidential election.
The former governor promised that the president is keen on addressing the concerns of marginalisation that has caused unrest in the region if he's given more time.
He said, "Marginalisation of Igbo did not start today. It is something that has been there immediately after the civil war; so, Buhari will not take only four years to correct it.
"We were not on board in 2015, but, we will be on board in 2019, and we will address the issue. I want to be involved when I have given the votes, because, when you give votes, you can ask questions.
"If I don't give votes, I cannot ask questions; I cannot come to paradise with 0.5 per cent votes for the president; I want to give the president over 70 per cent votes, than, I can ask questions and say 'I was sent by my people.'"
Even though President Buhari has failed to officially announce if he'll be seeking reelection in 2019, Dr Kalu said he'll convince him to run again.
"I joined the APC to encourage President Buhari to run again, and we are going to use his regime to correct the injustice meted to Ndigbo and also, fight for the oneness of the country.
"I didn't join the APC to go and look at the rock in Abuja; I joined the APC to use it for the benefit of Igbo and Nigeria at large," he said.