May 5, 2023 US National Security Advisor Jake Sullivan is set to arrive in Saudi Arabia on Saturday on the most senior visit by a Biden administration official since the presidential visit in July 2022, and on the heels of China's breakthrough deal between Riyadh and Tehran last March. Sullivan is expected to meet the country's de-facto ruler Saudi Crown Prince Mohammed bin Salman. The two spoke by phone on April 11, and White House Coordinator for the Middle East and North Africa Brett McGurk visited last month in anticipation of the visit. The US senior official will be joined…