Trump names Robert C. O'Brien as his 4th Security Adviser
Replacing ousted National Security Adviser John Bolton, Trump on Twitter names new Security Adviser. He tweeted 'I am pleased to announce that I will name Robert C. O’Brien, currently serving as the very successful Special Presidential Envoy for Hostage Affairs at the State Department, as our new National Security Advisor. O’Brien will be 4th national security advisor to Trump, after Michael Flynn, H.R. McMaster, and Bolton.