United States President, Donald Trump, has appointed a former United Nations ambassador John Bolton, as the new National Security Adviser.
He replaces HR McMaster as the NSA, the BBC reports.
Mr. Trump tweeted to thank Gen. McMaster, saying he had done an “outstanding job and will always remain my friend.”
Mr. Bolton, who has backed attacking North Korea and Iran, told Fox News his job would be to ensure the President has “the full range of options.”
He becomes Mr. Trump’s third national security chief in 14 months.
Gen. McMaster is the latest high-profile departure from the White House.
Last week, Mr. Trump fired Secretary of State, Rex Tillerson by a tweet, replacing him with former CIA Director, Mike Pompeo.
Mr. Bolton’s appointment does not require U.S Senate confirmation. He will take the job on April 9.
Mr. Bolton, 69, has been a foreign policy hawk in Republican circles for decades, having served in the administrations of Ronald Reagan, George HW Bush and George W. Bush.
The second Bush appointed him as U.S envoy to the UN, during which time diplomats privately criticised Mr. Bolton’s style as abrasive.
A strident neo-conservative, Mr. Bolton helped build the case that the late Iraq President, Saddam Hussein, possessed weapons of mass destruction, which turned out to be wrong.