 President Biden holding a press conference at the NATO summit in Washington yesterday as he defends his ability to serve as president. Republican South Carolina Senator Lindsey Graham joined Fox's Jesse Waters primetime calling for the president to take a cognitive exam. We need the president of the United States to take a neurological exam, and here's why he won't. He will fail it. During the press conference, the president said he would take an exam if the doctors say he should have one, but adds, quote, no one's suggesting that.