House Oversight Chairman James Comer is requesting former President Joe Biden's White House physician, Kevin O'Connor, appear for a transcribed interview as part of an investigation into Biden's mental fitness and use of a presidential autopen while in office.

In Biden’s case, doctors say the cancer is serious but still treatable, though not curable. President Donald Trump, 78, had a PSA test earlier this year, according to medical records that have been made public — meaning some doctors are still choosing to screen older patients for prostate cancer.