Recall that the US. Sec. of State, Rex Tillerson was in Nigeria on 12 March 2018, he was subsequently received in Aso Rock by Nig President Buhari on the same day 12 March 2018
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Today, 13 March 2018, President Trump just made a tweet about his sack.
The reason for this sack may not be unconnected with the internal politics of the Trump Administration.
See Tweet below…