John Bolton, a former U.S. ambassador to the United Nations, will replace Lt. Gen. H.R. McMaster as President Donald Trump's national security adviser.
"After 34 years of service to our nation, I am requesting retirement from the U.S. Army effective this summer after which I will leave public service," McMaster said in a statement released by the White House. "I am thankful to President Donald J. Trump for the opportunity to serve him and our nation as national security advisor."
The move has been rumored for some time. The New York Times reported that McMaster and Trump have been discussing his departure for several weeks because McMaster felt that speculation about his future was affecting his dealings with foreign leaders.
In the White House statement Trump thanked McMaster and credited him with helping to "develop our America First National Security Strategy, revitalize our alliances in the Middle East, smash ISIS, bring North Korea to the table, and strengthen our nation’s prosperity."
The White House statement called Bolton, who is known for his hard-line views on foreign policy, "one of the strongest voices and experts on the full range of national security issues and challenges facing the country."
McMaster joined a White House reeling from the departure of Michael Flynn, Trump's first national security adviser. Along with Chief of Staff John Kelly, McMaster was expected to bring discipline and order to the president's staff.