President Muhammadu Buhari received security briefings from three Northern Governors, before he left for the US on Sunday. They are Kashim Shettima, governor of Borno state; Abdullahi Ganduje, his Kano counterpart and Aminu Tambuwal of Sokoto. The briefing took place at the Presidential Villa in Abuja. Tambuwal’s media aide, Imam Imam, posted image of the …