- National Security Advisor retired US Army Lieutenant General Michael Flynn resigned on 13 February
- Flynn's chief of staff, US Army Lieutenant General Joseph Keith Kellogg (ret'd), was named the acting National Security Advisor
- The resignation ends weeks of controversy surrounding the details of calls between Flynn and Russia's ambassador to the United States
The top national security official in the White House delivered his resignation to President Donald Trump late on 13 February after weeks of controversy surrounding communication with a Russian official.
Michael Flynn, who had been one of the few seasoned national security experts to support Trump early in his campaign and had been rewarded with the post of National Security Advisor, delivered his resignation after several hours of conflicting statements from the White House about Trump's support for Flynn.