Update at 1630 EST: This article has been updated to include additional details over the circumstances of Bolton’s departure and comments from experts.

U.S. President Donald Trump on Tuesday announced he had fired National Security Advisor John Bolton, citing disagreements between the two.

Bolton, who is often seen as hawkish within Washington and is typically thought of as a taking a hard line of foreign policy issues like North Korea and Iran, had reportedly clashed with the President on a number of issues.

“I informed John Bolton last night that his services are no longer needed at the White House,”