President Muhammadu Buhari Aso Rock, Abuja Nigeria Dear President Buhari: When you visited the United States Institute of Peace last July, you pledged that you would be “fair, just and scrupulously follow due process and the rule of law, as enshrined in [the Nigerian] constitution” in prosecuting corruption. Such loftiness is laudable. As the Bible instructs in Amos 5:24: “[L]et justice roll down like waters, and righteousness like an ever-flowing stream.” But to be just, the law must be evenhanded. It cannot, in the manner of Russian President Vladimir Putin, be something that is given to punish your enemies and withheld to favor your friends. If so, the law becomes an instrument of injustice bearing earmarks of the wicked rather than the good. In the United States, you declared a policy of “zero tolerance” against corruption. You solicited weapons and other assistance from the United States government based on that avowal. But were you sincere? During your election ca...