McMaster as his national security adviser effective April 9 -- the latest in a growing list of White House staff shakeups over the past year. “I am pleased to announce that, effective 4/9/18, @AmbJohnBolton will be my new National Security Advisor. A White House official said the decision was not related to any one moment or incident, but rather the result of ongoing conversations between the two. The position of White House national security adviser does not require Senate confirmation. McMaster was brought in after Trump's first national security adviser, Michael Flynn, was dismissed after less than a month in office.

Source: Fox News March 22, 2018 22:33 UTC