Trump fires national security adviser John Bolton

US President Donald Trump on Tuesday forced out John Bolton, his hawkish national security adviser with whom he had significant disagreements on Iran, Afghanistan and a cascade of other global challenges.

The two men offered opposing accounts on Bolton's less than friendly departure, a leave-taking example of what had been a fractious relationship almost from the start.

"I informed John Bolton last night that his services are no longer needed at the White House. I disagreed strongly with many of his suggestions, as did others in the Administration," Trump tweeted.

"I asked John for his resignation, which was given to me this morning. I thank John very much for his service. I will be naming a new National Security Advisor next week," he added.