Dr. Ronny Jackson calls on Biden to immediately undergo cognitive test to assess 'mental impairment'

Former White House physician explains why the president needs a cognitive test on'Hannity' Dr. Ronny Jackson, the former White House physician, called on President Biden to immediately undergo a cognitive test so the commander-in-chief can prove to the American public sound mental capabilities. "We can't sit on this any longer," Jackson told "Hannity" Thursday night, citing Biden's "embarrassing" performance overseas this week with world leaders. "He's not physically or cognitively fit to be our president right now," Jackson added. The freshman Texas congressman and 13 other GOP members of Congress sent a letter to Biden Thursday expressing "concern" with his cognitive state and cited several examples of potential memory lapses, including apparently forgetting the name of his Defense Secretary, telling an Amtrak story with a timeline that didn't add up and seemingly blanking on the often-quoted first line of the Declaration of Independence. "Unfortunately, your mental decline and forgetfulness have become more apparent over the past 18 months," Jackson and the GOP reps wrote in a letter to Biden, the White House physician and Dr. Anthony Fauci.