Donald Trump has been sworn in as U.S. president, ushering in another four-year term with promises to push the limits of executive power, deport millions of immigrants, secure retribution against his political enemies and transform the role of the U.S. on the world stage. Trump’s inauguration completes a triumphant comeback for a political disruptor who survived two impeachment trials, a felony conviction, two assassination attempts and an indictment for attempting to overturn his 2020 election loss. We speak with Historian Sean Wilentz, a professor of history at Princeton University.