National security adviser Mike Waltz is leaving his White House post, although soon after reports about his departure were published, President Trump announced he plans to nominate him to be ambassador to the United Nations.

US National Security Adviser Mike Waltz is leaving his post with the Trump adminstration, according to media reports. Waltz, who was the president's principal adviser on national security issues, has had a difficult tenure amid accusations that senior officials used insecure methods of communication to conduct government business.