(NBC News) John Bolton, the former U.S. ambassador to the United Nations, will replace H.R. McMaster as national security adviser, President Donald Trump announced in a tweet Thursday.
“I am pleased to announce that, effective 4/9/18, @AmbJohnBolton will be my new National Security Advisor,” Trump tweeted. “ I am very thankful for the service of General H.R. McMaster who has done an outstanding job & will always remain my friend.”
“There will be an official contact handover on 4/9,” Trump added.