Minibus driver Solomon Murimia calls on clients next to his "matatu" minibus with a painting depicting US Presidents Abraham Lincoln and Barack Obama and US civil rights activist Martin Luther King on July 22, 2015 in Nairobi. Obama will make his first presidential pilgrimage to his father's homeland of Kenya later this month, the cap to a week-long trip to three key African nations.  AFP PHOTO / SIMON MAINA        (Photo credit should read SIMON MAINA/AFP/Getty Images)