Donald Trump is to be sworn in as the 45th President in the United States in a ceremony that has been beset by controversy and speculation.

Here's a timeline of today's events - all times EST (GMT):

Before the ceremony

8.30am (1.30pm): Donald and Melania Trump attend service at St. John's Church.

Trump says if it rains at inauguration 'people will realise it's my real hair'

9.40am (2.40pm): President Barack Obama and first lady Michelle Obama welcome the Trumps to the White House.

9.45am (2.45pm): Obamas host a coffee and tea reception for the Trumps.

10.30am (3.30pm): Trumps and Obamas leave White House for US Capitol.

Rehearsal for Presidential Inauguration Show all 13 1 /13 Rehearsal for Presidential Inauguration Rehearsal for Presidential Inauguration The US Capitol building is seen ahead of the upcoming inauguration of President-elect Donald Trump Getty Images Rehearsal for Presidential Inauguration Participants take part in a rehearsal for the inauguration of President-elect Donald Trump at the US Capitol in Washington DC Getty Images Rehearsal for Presidential Inauguration Army Sgt. Maj. Greg Lowery, left, playing the part of President-elect Donald Trump, and Army Spc. Sara Corry, playing the part of Melania Trump, walk along the parade route during a dress rehearsal for Inauguration Day in Washington, DC Getty Images Rehearsal for Presidential Inauguration Work is still being performed on the stage ahead of next week inauguration at the US Capitol in Washington DC Getty Rehearsal for Presidential Inauguration A sign welcoming President-elect Donald Trump is seen near the White House in Washington, DC Getty Images Rehearsal for Presidential Inauguration Workers prepare the West Front of the US Capitol for the upcoming inauguration of President-elect Donald Trump Getty Rehearsal for Presidential Inauguration A marching band rehearses on the East side of the US Capitol in Washington DC, during a dress rehearsal Getty Images Rehearsal for Presidential Inauguration Members of the US Army band march down Pennsylvania Avenue during an inaugural parade rehearsal in Washington DC Rehearsal for Presidential Inauguration Maxine McGinnis arranges the Trump paraphernalia for sale on a store shelf at the White House Gifts store in Washington DC Getty Rehearsal for Presidential Inauguration Donald Trump hot sauce is seen for sale on the store shelf of Stars and Stripes store as President-elect Donald Trump prepares to take the reins of power. The inauguration will take place on January 20th when President Barack Obama ends his 8 year run as Americas president Getty Images Rehearsal for Presidential Inauguration Sarah Chambers shops for Trump paraphernalia at the White House Gifts store as President-elect Donald Trump prepares to take the reins of power as President in Washington DC Getty Images Rehearsal for Presidential Inauguration The Washington Monument is seen as preparations continue for the presidential inauguration of President-elect Donald Trump Getty Images Rehearsal for Presidential Inauguration Workers prepare the stage in front of the Lincoln Memorial to be used in the presidential inauguration festivities for President-elect Donald Trump as he prepares to take the reins of power in Washington DC Getty Images

At the Capitol

11.16am (4.16pm): Senator Roy Blunt, Inaugural Committee chairman, delivers opening remarks.

11.21am (4.21pm): Timothy Michael Cardinal Dolan, Rev Dr Samuel Rodriguez and Pastor Paula White-Cain deliver invocations.

11.30am (4.30pm): Senate Minority Leader Chuck Schumer delivers remarks.

11.35am (4.35pm): Vice Presidential oath is administered by Associate Justice Clarence Thomas.

11.47am (4.47pm): Presidential oath is administered by Chief Justice John Roberts.

11.51am (4.51pm): President Donald Trump delivers inaugural address.

12.12pm (5.12pm): Rabbi Marvin Hier, Rev. Franklin Graham and Bishop Wayne T Jackson deliver benedictions.

President-elect Donald Trump and his wife Melania Trump arrive at a pre-inauguration "Make America Great Again! Welcome Celebration" (AP)

After the ceremony

12.30pm (5.30pm): Obama departs by helicopter from East Front of the Capitol building.

12.54pm (5.54pm): President's Room signing ceremony.

1.08pm (6.08pm): Luncheon.

2.35pm (7.35pm): Review of the troops.

3pm (8pm): Parade from the Capitol to the White House.

7pm (midnight): Inaugural balls get underway.

Workers assemble the stage for the Commander-in-Chief Ball at the National Building Museum (EPA)