Donald Trump has shown no abnormal signs following a cognitive test and is in "excellent" health, the White House physician said after the 71-year-old USA president underwent his first medical check-up amidst speculation about his mental abilities.
Trump also received a ideal score (30/30) on the Montreal Cognitive Assessment (MoCA) - a standard, one-page test created to test a person's thinking and memory skills for signs of dementia, Jackson said.
"I have no concerns about his cognitive ability or his neurological function, so I was not going to do a cognitive exam; I had no intention", Adm. Jackson added.
Jackson says Trump is healthy and should remain so for the remainder of his presidency.
A book published earlier this month, "Fire and Fury" by Michael Wolff, asserted that even Trump's own advisers and associates questioned his fitness for office.
Jackson said such testing wasn't originally in the plan for the physical, and isn't recommended by doctors for patients of Trump's age.
Jackson said Trump received a ideal score on a cognitive test created to screen for neurological impairment.
He said despite the president's love of fast food and lack of exercise he was in good health, and that he has "incredible genes".
He then cited Jackson, saying he believed the White House physician alluded to the calcium score increasing because of Trump's diet and lack of exercise.
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Trump has bragged in the past about his health and energy as well as his IQ score, which he said in 2013 is "one of the highest".
"It's called genetics. I don't know".
"He would benefit from a diet that is lower in fat and carbohydrates", Jackson told reporters at the White House.
"Gunn wasn't alone in questioning the authenticity of Trump's purported 239-pound weight and 6'3" height, which is different from what his driver's license said.
But Dr Jackson said he likely just needed a drink of water. Later, Trump attempted to clarify matters by tweeting he was a "very stable genius".
The president, Jackson declared during a White House press briefing, is in "excellent health".
Trump had requested such a test be included in his checkup, in response to concerns about his cognitive abilities, Jackson said. "I've never known him to repeat himself when he's around me".
The president's current roster of medicines includes a daily multivitamin; 10 milligrams of Crestor for his cholesterol; 81 milligrams of low-dose aspirin daily to help maintain heart health; and 1 milligram of Propecia for male pattern baldness, Jackson said.