He said Bolton will take over April 9 as his third national security adviser in just over a year. McMaster is out as U.S. President Donald Trump's national security adviser, Trump tweeted Thursday evening. Divisive foreign policy expertBolton, probably the most divisive foreign policy expert ever to serve as UN ambassador, has served as a hawkish voice in Republican foreign policy circles for decades. U.S. National Security Adviser H.R. McMaster was brought in after Trump's first national security adviser, Michael Flynn, was dismissed after less than a month in office.

Source: CBC News March 22, 2018 22:43 UTC