Smithsonian Secretary Lonnie Bunch to retire amid clashes with Trump administration

Smithsonian Secretary Lonnie Bunch announced he will be stepping down from his position leading the institution by the end of the year. NBC News' Andrea Mitchell has details on Bunch's accomplishments and past tensions with President Trump and his administration.

Smithsonian Secretary Lonnie Bunch announced he will be stepping down from his position leading the institution by the end of the year. NBC News' Andrea Mitchell has details on Bunch's accomplishments and past tensions with President Trump and his administration.