writer dexter filkins joins me for a closer look. plus, philosopher, theologian and humanitarian jean vanier. a man who followed his faith and spent his whole life uplifting the intellectually disabled. >>> good evening and welcome to the program. i'm christiane amanpour in london. saudi crown prince mohammed bin salman has been in the united states for almost three weeks now, kicking off a massive pr project with a visit and warm embrace at the white house and then hopscotching all over the map, visiting six other cities, meeting with high-powered executives like richard branson, bill gates and jeff bezos, the crown prince is looking for american investment in his new reform program called vision 2030 that calls, amongst other things, for a massive overall of the fossil fuel economy. mohammed bin salman, known almost universally as mbs, has won place for reforms like lifting the ban on women driving and trying to moderate the kingdom's hard core brand of islam. but he's attracted criticism for his ruthless fixation on gaining and ke