Siphiwe Sibeko/Reuters Former President Barack Obama offered a sharp rebuke of his successor's worldview. He delivered the 2018 Nelson Mandela Annual Lecture in South Africa, slamming "strong man" politics and the rejection of intellectualism he feels is permeating today's political culture. Obama did not once say President Donald Trump's name during the address, but his words represented a biting critique of the current president's political philosophy.