Secretary of State, Mike Pompeo, imposed the visa restriction on the individuals due to their conduct in the run up to the polls.
Intelligence report on Iran by a political risk consultancy indicates that the collapse of the regime is highly unlikely because too many Iranians depend on the sustainability of the economic structure.
Tens of thousands of civilians have lost their lives in Nigeria in recent years to violent attacks by terrorist groups due to their religious beliefs or in intercommunal violence, Secretary Pompeo lamented.
In a statement that shows no remorse for leading the country down that ignoble road, President Buhari tried to justify the ban.
Iran said on Saturday its military had mistakenly shot down a Ukrainian plane killing all 176 aboard, saying air defenses were fired in error while on high alert in the tense aftermath of Iranian missile strikes on U.S. targets in Iraq.