Last month, the Nigerian bank chief was involved in a helicopter crash in California, which killed six people.
The levy, imposed last week, has been met with widespread condemnation from the private sector.
Nigeria continues to search for nearly 300 schoolchildren taken in the northern town of Kuriga.
MMA fighter Francis Ngannou says he intends to continue in boxing despite a heavy loss to Anthony Joshua on Friday.
Twice in a week, gangs of motorcycle-riding armed men kidnapped hundreds of people in the north.
Anthony Joshua delivers the most powerful statement to the heavyweight division with a destructive second-round knockout win over Francis Ngannou.
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