Donald Trump ignited a standoff between the United Arab Emirates and Saudi Arabia with a phone call. Trump contacted UAE President Sheikh Mohammed bin Zayed last November regarding what he said was a request from Saudi Crown Prince Mohammed bin Salman to impose sanctions on the UAE. Trump said Salman made the request earlier that month, citing the UAE’s support for the Rapid Support Forces, a mercenary group fighting in Sudan’s civil war. After the call, The New York Times reports, tensions betw...