Washington, Rajab 06, 1439, March 23, 2018, SPA --  Former US ambassador to the UN John Bolton will replace HR McMaster as US National Security Advisor next month, President Donald Trump announced Thursday. "I am pleased to announce that, effective 4/9/18, Ambassador JohnBolton will be my new National Security Advisor," Trump wrote on Twitter. McMaster had done "an outstanding job and will always remain my friend," Trump added. --SPA 03:20 LOCAL TIME 00:20 GMT www.spa.gov.sa/w648806