Trump names Robert O'Brien new US NSA

US President Donald Trump on Wednesday named Robert O'Brien, a State Department official who has specialized in hostage issues, as his new 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 Adviser," Trump tweeted.

"I have worked long and hard with Robert. He will do a great job!"

O'Brien will replace John Bolton, whom Trump fired last week after a string of disagreements.IANS