President Joe Biden underwent a closely watched physical examination Thursday at Walter Reed National Military Medical Center in nearby Bethesda, Maryland, ahead of an expected announcement that he is seeking a second four-year term. The physical exam is the second extensive exam for Biden since he took office in January 2021. Last November, his physical and colonoscopy showed the president to be a “healthy, vigorous, 78-year-old male,” according to his doctor. Dr. Kevin O’Connor, the president’s personal physician, said the physical exam was “comprehensive and included a number of tests to assess the president’s overall health and fitness for duty.” The results of the exam will be released in the coming days. Biden is expected to make a formal announcement of his candidacy for a second term in the coming weeks. He has already amassed an impressive war chest of more than $100 million, and has a commanding lead in national polls over potential Republican challengers. The physical exam is part of Biden’s effort to demonstrate his fitness for the job of president. At 80 years old, Biden would be the oldest president in U.S. history if he were to win a second term. The physical exam is also being closely watched by the American public, as Biden’s health and fitness for office will be a major factor in the upcoming election.