President Trump announced in a tweet on Wednesday that he will name Robert O’Brien to succeed John Bolton as his national security adviser. “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​,” the president said. “I have worked long & hard with Robert. He will do a great job!​”​ ​The announcement comes a day after Trump released the five finalists on his list and called O’Brien “fantastic.”