The president made the remark during a Channels Television interview on Wednesday.
Commenting on the trial of the IPOB leader during the interview, the president said: “There’s one institution I would not dare interfere with — that is the judiciary.
“Kanu’s case is with the judiciary. But what I wonder is when Kanu was in Europe abusing this administration, I never thought he would voluntarily come and defend himself on the accusations.
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“So we are giving Kanu an opportunity to defend himself in our system, not to be abusing us from Europe as if he was not a Nigerian. Let him come here and criticise us here.
“His case is with the judiciary, let him be listened to.”
Asked if there was a possibility of a political situation to his case, Buhari replied: “There’s no possibility of a political solution.
“If he behaves himself, all well and good. But you can’t go to a foreign country and keep sending incorrect security and economic problems against your country — and think he will never account for what he has been doing… let him account for what he has been doing.”