The President whose cabinet James Mattis served on assumed office on what date?
Cabinet of Donald Trump This article lists the members of President Donald Trump's Cabinet. Trump assumed office on January 20, 2017.
Inauguration of John F. Kennedy The inauguration of John F. Kennedy as the 35th President of the United States was held on Friday, January 20, 1961 at the eastern portico of the United States Capitol in Washington, D.C.. The inauguration marked the commencement of John F. Kennedy's only term as President and of Lyndon B. Johnson's only term as Vice President. Kennedy was murdered into this term, and Johnson succeeded to the presidency.