“Africa is the most important area of operations for Islamic State,” said Hans-Jakob Schindler, the former coordinator of the U.N. Security Council’s panel on Islamic State and al Qaeda. But Nigeria is a particular focus because it involves violence against Christians that resonates with Trump’s political base, Schindler said.

Attuned to Trump’s concerns, the Nigerians made a point Saturday of highlighting al-Mainuki’s role in overseeing attacks against ethnic and religious minorities. Trump made a point of thanking the Nigerian government for its role in the operation.