Former White House physician says Democrats should follow through on cognitive demands and test Biden Caitlin McFall EXCLUSIVE: Texas Republican Rep. Ronny Jackson, the former White House physician for Donald Trump, called on Democrats to follow through with their prior demands regarding a president’s cognitive ability and have President Joe Biden assessed. Following speculation on Trump’s mental aptitude one year into his presidency, he agreed to take the Montreal Cognitive Assessment (MoCA) – a 30 point exam that tests for memory impairment. "The far left and the mainstream media were demanding that be the new standard for anybody who’s going to lead our country and be our Commander-in-Chief and our head of state," Jackson said in an interview with Fox News on Saturday. "I’m just saying I agree with them at this point -- we need to get it done."