Saudi Interior Minister Mohammed bin Nayef, perhaps the most powerful younger prince in the ruling al-Saud family, is shaping Riyadh’s new emphasis on protecting the kingdom from a fresh wave of Islamist militancy inspired by the war in Syria. The United States pulled out the stops for him when he visited Washington last week to prepare for President Barack Obama’s fence-mending trip to Riyadh next month. Secretary of State John Kerry, National Security Adviser Susan Rice, Central Intelligence Agency chief John Brennan, Homeland Security Secretary Jeh Johnson, Federal Bureau of Investigation director James Comey and National Security Agency director Keith Alexander all sat down with the 54-year-old, a veteran of Saudi Arabia’s fight against al Qaeda. Prince Mohammed seems likely to be a central figure in the world’s top oil exporter for decades to come. Many Saudis say he is a strong candidate to become king […]