This was a major theme in Michael Wolff's "Fire and Fury", the explosive book published last week, which Trump has called "untruthful", "fake" and "phony".
Mr Trump, who declined to release a detailed report on his health while running in 2016 - though his doctor did release a letter then vouching for his good shape - is the oldest person in history to be elected to America's highest office.
More questions have been raised in the weeks since, given the tone of some of his tweets and the reported comments of some of the people who deal with him day to day. The White House wouldn't say whether doctors would test the president's cognitive abilities. Roughly 260,000 service members leave the military each year; the Naval Postgraduate School study stated that roughly 18.5% of veterans returning from Iraq or Afghanistan suffer from post-traumatic stress disorder or depression. Before departing Washington for his Mar-a-Lago residence in Florida, he will make the 11km trip to Walter Reed National Military Medical Center in Bethesda just north of DC.
Here in the USA, there is a lot of media interest in the president's health and Donald Trump was asked about his medical check-up by reporters yesterday.
Do presidents have to have a physical while they are in office?
President Donald Trump likes to take credit for last year's stock market gain, but on Thursday he admitted that the results of his scheduled medical examination on Friday could be responsible for its fall.
How much of Trump's health information the public gets to see is up to him, but Sanders said she expects him to release the same kind of details as past presidents.
"We are not stating that Mr. Trump has a certain condition or that any of these are definitive conclusions", Lee said in an interview.
He also said Trump took Crestor, a cholesterol-lowering statin; a low dose of aspirin to prevent heart attacks; antibiotics to treat skin rosacea; and Propecia for baldness. The one-page letter stated Trump's testosterone level, 441.6, was in the normal range, as were his PSA reading for prostate abnormalities and tests of his liver and thyroid.
Trump thinks Oprah won't run, says he'd defeat her anyway
Almost seven in 10 voters overall, including a majority of Democratic voters, said in the survey they didn't want Winfrey to run. This is the first time that anyone close to the American icon has admitted that she has ambitions for the White House.
He expanded mental health services for veterans who are at risk of hurting themselves.
Will Fischer, an Iraq War veteran and Director of Government Relations for VoteVets, said Mr. Trump "should delete the entire second half of his executive order, which moves the VA closer to privatization".
Added Trump: "It got great reviews by everybody other than two networks, who were phenomenal for about two hours".
"I do enjoy this", he told the four Journal reporters assembled in the Oval Office.
Trump has made no attempt to hide his weakness for unhealthy foods, posting a photo of himself aboard his campaign plane with a bucket of fried chicken, bragging about the chocolate cake at his Mar-a-Lago resort and drinking Diet Coke around the West Wing.
Listen to Mary J. Blige's New Song 'Bounce Back'
Blige received the 2,626th star on the Hollywood Walk of Fame yesterday (January 11), which just happened to be her birthday. Blige became the latest artist to receive a star on the Hollywood Walk of Fame .
Past physicals have also provided a glimpse into the president's habits.
Before jetting off to his private Mar-a-Lago resort on Friday, President Donald Trump will have to open up and say 'ahhh'.
Neither measure has advanced in Congress.
Protests urged for Trump Atlanta visit
They plan to "take a knee against Trump" outside CNN's world headquarters shortly before Trump arrives two hours prior to kickoff.