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.
Second inauguration of Ronald Reagan The second inauguration of Ronald Reagan as President of the United States was held privately on Sunday, January 20, 1985 in the Grand Foyer of the White House, and publicly the following day, January 21, 1985 at the United States Capitol in Washington, D.C. The inauguration marked the commencement of the second four-year term of Ronald Reagan as President and of George H. W. Bush as Vice President.