Facing growing scrutiny over his age, President Joe Biden came out swinging Thursday night with a forceful State of the Union address that set the tone for the 2024 general election. Will his performance assuage doubts about his fitness, at age 81, to lead the U.S. through an increasingly volatile global order? In this episode, Jacob Heilbrunn speaks with Harry J. Kazianis, executive editor of The National Interest. Kazianis previously served as part of the foreign policy team for Senator Ted Cruz's 2016 presidential campaign and worked for the conservative Heritage Foundation.