The 10-minute exam is created to detect mild cognitive impairment, such as dementia, generally in older patients.
The doctor speculates that Trump requested the exam in an attempt to beat back the narrative of the past few weeks that he is mentally unfit for office.
Trump himself countered the claims on Twitter earlier this month, saying he was a "very stable genius".
'The reason that we did the cognitive assessment is, plain and simple, because the president asked me to do it'.
Another question asks the subject to replicate the drawing cube and a clock with a specific time shown on it, as accurately as possible, to test their visuoconstructional skills. It is not a psychological exam. Jackson said the water-gulping incident was a result of Suddafed. His thyroid was normal, and there were no issues with his teeth or gums.
"We are not going to be held hostage to bad policies", Democratic Minority Whip Steny Hoyer said.
Jackson has already increased the dosage of the Trump's cholesterol-lowering medication and recommended a low-carbohydrate and low-fat diet, along with an exercise regimen. As the White House struggled to put the call in listen-only mode for 22 minutes, to mute the chatter from dozens of reporters on their phones, an unknown voice said to everyone listening: "This White House can't even run a f***ing conference call". "He has incredible genes I just assume", Jackson said.
Jackson has cared for three presidents since joining the White House medical unit in 2006. His mother died at 88 and his father lived to 93, though he suffered from Alzheimer's disease for about five years.
The concerns over his weight aside, Jackson said Trump was in excellent health, which he ascribed to good genetics and a lifelong avoidance of tobacco and alcohol.
On Friday, Trump denied having made those controversial statements in a tweet.
Jackson held an extraordinary news conference - on Trump's insistence - yesterday at the White House that lasted for about an hour.
The president has also noted that he sleeps only about 4 to 5 hours per night, and Jackson confirmed that. He reminded reporters that as chief White House physician, he sometimes provides medical care for reporters who get sick while covering the president. She read a letter written by Richard Tubb, a former physician to the president who trained Jackson and vouched for his integrity.
A bipartisan group of United States senators will reveal on Wednesday an immigration bill that was agreed to by Democrats and Republicans, despite the fact that President Donald Trump rejected it.
Men who stand at 6-foot-3 and weigh 239 pounds are not created equally.
The president's past medical history includes hypercholesterolemia, a condition that is caused very high levels of cholesterol in the blood; and rosaccea, a common skin disease that is characterized by a person blushing or looking flushed more easily than other people.