 I do know, according to a summary report released in February by the White House, that the president was seen by a neurologist and had shown no signs of Parkinson's. But of course, there is so much scrutiny on this, given all the questions about the president's mental fitness. President Biden, for his part, has said that he doesn't need to take a cognitive test, that his doctors have told him as well that he does not need to take one. The president defiant, saying that he takes a cognitive test every day doing this job. ABC's Selena Wang.