Today was President Trump's last full day in office. We look back on four tumultuous years of "unprecedented" moments and the tense political atmosphere we're left with.

On Today's Show:Susan Glasser, staff writer for The New Yorker, CNN global affairs analyst and co-author, with Peter Baker, of The Man Who Ran Washington: The Life and Times of James A. Baker III (Doubleday, 2020), reflects on the President's tenure, including the norms he blasted through, the major policy decisions, the two impeachments and the insurrection he incited. Plus, callers weigh in on how their political thinking has changed over the course of the Trump administration.