Former U.N. Ambassador John Bolton to replace H.R. McMaster as national security adviser

President Donald Trump is replacing national security adviser H.R. McMaster with John Bolton, a former U.S. ambassador to the United Nations.Trump tweets that McMaster has done "an outstanding job & will always remain my friend." He says Bolton will take over April 9.I am pleased to announce that, effective 4/9/18, @AmbJohnBolton will be my new National Security Advisor. I am very thankful for the service of General H.R. McMaster who has done an outstanding job & will always remain my fr