NPR reports:
President Trump has fired national security adviser John Bolton, the lifelong proponent of American hard power, after months of division between the men over the direction of foreign and national security policy. Trump announced the news on Tuesday in a post on Twitter.
Bolton was Trump’s third national security adviser and continued the pattern of departures by advisers who proved a bad fit for a White House led by the rare president with no prior experience with the military, national security or elected office.
Bolton’s aggressive positions on Venezuela, North Korea and Afghanistan clashed with the comparative reluctance of his boss to entertain new confrontations and wind down some old ones.
I informed John Bolton last night that his services are no longer needed at the White House. I disagreed strongly with many of his suggestions, as did others in the Administration, and therefore….
— Donald J. Trump (@realDonaldTrump) September 10, 2019
….I asked John for his resignation, which was given to me this morning. I thank John very much for his service. I will be naming a new National Security Advisor next week.
— Donald J. Trump (@realDonaldTrump) September 10, 2019
Bolton was Pres Trump's 3rd National Security Advisor after Michael Flynn and H. R. McMaster, both of who also were asked to tender their resignations. Bolton has served since April 9 2018.
— Mark Knoller (@markknoller) September 10, 2019