The President of Nigeria normally swears in the Chief Justice, but was not available due to illness.
The President and any Acting President swears the following oath:
The President so swore.
The President swears; declares that every one shall swear, in distinct je le jure.
Since the President and Congress must swear to uphold the Constitution, he asserts that they would not dare shirk their duty to implement a new amendment.
On Thursday, the President swore in his new director of drug policy.
Then the President swears in the Prime Minister and the Government.
The Founders carefully specified that the newly elected President could swear "or affirm," which covered atheists.
The issue is obstruction of justice, which the President has sworn the most solemn oath to uphold.