Donald Trump tweets his work is about to begin

District of Columbia: Hours before his inauguration Friday, US President-elect Donald Trump tweeted that his job of shaking up America`s political and economic status quo is about to begin.

Trump turned to his favorite mode of communications at one of his favorite tweet times -- early morning -- as crowds began to gather on the National Mall in the center of Washington for his swearing-in as the 45th US president.

The political outsider, real estate mogul and former TV reality star wrote: "It all begins today! I will see you at 11:00 A.M. for the swearing-in. THE MOVEMENT CONTINUES - THE WORK BEGINS!"

An estimated 800,000 people are forecast to turn out at the foot of the Capitol and along the vast Mall to witness the culmination of Trump`s unlikely bid for the White House.