While Trump had talked with Secretary of State Rex Tillerson about Saudi Arabia as they toured Tokyo together Nov. 5 and 6, there was no formal consultation before he tweeted early Tuesday that King Salman and Crown Prince Mohammed Bin Salman “know exactly what they are doing.”…

“Having the United States in many ways supporting a position that is seen as quite controversial can be problematic for the region,” Raihan Ismail, an associate lecturer at the Centre for Arab and Islamic Studies at the Australian National University in Canberra, said by phone. “Regional instability will continue to spook foreign investors. The Trump administration is seen as erratic.”