Read previewJoe Biden is facing mounting pressure to prove he's medically fit to run for a second term, but experts say a cognitive test could set a dangerous precedent. Speaking on CBS's "Face the Nation," Sen. Lindsey Graham said all presidential nominees, including Biden and Trump, should take a cognitive test. Cognitive tests are usually quick and simple and can check for functions such as concentration, abstract thinking, language, and memory. He told ABC's Stephanopoulos on Friday: "I have a cognitive test every single day." According to White House press secretary Karine Jean-Pierre, after Biden's physical in February, his doctors decided he didn't need a cognitive test.

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