Donald Trump will undergo health check-up amid speculation on his mental health

The US President's medical examination comes after speculation, including in journalist Michael Wolff's recently released book 'Fire and Fury', that he is mentally unfit for the role as head of state, according to The Telegraph.

The White House said results of the examination will be released.

Mr Trump will have his heart, blood and urine tested.

It is reported he will also face questions on his sleeping habits and sex life.

He will be examined by the same doctor that gave Barack Obama his last several physicals.

The news follows a slew of tweets from the US president in which he declared himself to be "a very stable genius" and of "being, like, really smart".

Now that Russian collusion, after one year of intense study, has proven to be a total hoax on the American public, the Democrats and their lapdogs, the Fake News Mainstream Media, are taking out the old Ronald Reagan playbook and screaming mental stability and intelligence.....

— Donald J. Trump (@realDonaldTrump) January 6, 2018

....to President of the United States (on my first try). I think that would qualify as not smart, but genius....and a very stable genius at that!

— Donald J. Trump (@realDonaldTrump) January 6, 2018

....Actually, throughout my life, my two greatest assets have been mental stability and being, like, really smart. Crooked Hillary Clinton also played these cards very hard and, as everyone knows, went down in flames. I went from VERY successful businessman, to top T.V. Star.....

— Donald J. Trump (@realDonaldTrump) January 6, 2018

The results of the examination may also shed light on Trump's Jerusalem speech in December.

His slurring speech, which can be seen at the 45-minute mark below, was met with criticism and the rise of the twitter hashtag #DentureDonald.

The White House said his "throat was dry".