The results of the annual presidential physical exam are out and Donald Trump has been declared “fit for duty” by the presidential physician, Ronny Jackson.

The navy doctor delivered the assessment at an hour-long press conference at the White House, saying the president’s health was “excellent”, his mind was “sharp” and that he needed only four or five hours’ sleep a night.

“It used to be inside of 30 minutes he’d repeat, word-for-word and expression-for-expression, the same three stories – now it was within 10 minutes. Indeed, many of his tweets were the product of his repetitions – he just couldn’t stop saying something.” The claims in Wolff’s book have been rejected by the White House and Trump allies, but they do not exist in isolation.

Trump’s highly provocative behavior has routinely been the subject of public alarm. President Donald Trump is getting his first medical checkup since taking office, a head-to-toe exam as questions spin about the health and fitness of the oldest person ever elected to the nation's highest office.

Trump raised concern last month when he slurred some words on national TV. White House press secretary Sarah Huckabee Sanders said questions about Trump's health were "frankly, pretty ridiculous" and blamed his slurred speech on a dry throat, "nothing more than that."

More questions have been raised since, the tone of some of his tweets and the reported comments of some of the people who deal with him day to day.​​

The revelations in Michael Wolff’s explosive book about Donald Trump’s first year in office renewed enquiry of the US president Donald Trump’s mental health. 

Although the White House has condemned Wolff’s Fire and Fury as “complete fantasy”, the book sheds light on concerns among top White House aides over Trump’s psychological fitness for America’s highest office.

“Everybody was painfully aware of the increasing pace of Trump’s repetitions,” Wolff wrote. 

He drew even more attention to the book and the debate about his fitness with tweets stating that his two greatest assets in life "have been mental stability and being, like, really smart." Trump noted his success in business, reality TV and presidential politics, saying: "I think that would qualify as not smart, but genius and a very stable genius at that!"

The US president flew by helicopter to Walter Reed National Military Medical Center outside Washington in Bethesda, Maryland, for the exam. Dr. Ronny L. Jackson, a Navy rear admiral who is the president's official physician and director of the White House Medical Unit, is coordinating the exam.

Donald trump faces presidential fitness test during raised metal health concern.