Saudi Arabia's Crown Prince walked into the White House today, just years after being labelled an international pariah. President Trump welcomed Mohammed Bin Salman, the man increasingly seen as the Kingdom's most consequential leader in recent history. Few Americans know and understand MBS better than Princeton scholar Bernard Haykel. Haykel has interviewed the Crown Prince more than 20 times for his forthcoming book "The Realm" and he joins Christiane from Washington. 

Also on today's show: international reporter Steffano Pozzebon; former NSC Senior Director Juan Gonzalez; director Geeta Gandbhir ("The Perfect Neighbor")