For the next five months, Dr. Kevin C. O’Connor will be one of the most powerful people in the world.

The White House physician is the chief medical arbiter of Joe Biden’s fitness to continue as commander in chief in a war-torn world until the end of his term in January. Even as the public has long expressed concern about the 81-year-old president’s mental capacities and Democratic Party leaders pressured Biden to drop his bid for a second term, O’Connor has repeatedly given his boss a clean bill of health.

Growing numbers of people are questioning his medical judgment because O’Connor is much more than a doctor to the president. Records show that he is also a longtime friend, personal adviser, political donor, former paid campaign worker, and even a business consultant to the Biden family.

A former White House physician who attended to both Barack Obama and Donald Trump claims O’Connor has been trying to “cover up” Biden’s deteriorating condition to appease the first family, with whom he’s formed a tight bond over the past 15 years.