- Michael Flynn resigned his post of national security adviser facing allegations he lied about the extent of his interactions with the Russian ambassador to the United States in the wake of Donald Trump's election victory. Flynn held the job for only 24 days.
- The Senate confirmed former Goldman Sachs banker Steven Mnuchin as Treasury Secretary by a margin of 53-47.
- President Trump convened an ad hoc, unsecured national security meeting with Japanese Prime Minister Shinzo Abe at a public dinner table at his Mar-a-Lago club in response to North Korea's test-firing a ballistic missile.