Nineteen months after descending that golden escalator in the lobby of Trump Tower to launch his improbable bid for the White House, the new president strides into the grounds of 1600 Pennsylvania Avenue.
One of the most remarkable campaigns in living memory ends here, as he takes over as 45th commander-in-chief.
James "Mad Dog" Mattis has been confirmed by the Senate.
The retired Marine general is Trump's first nominee to be formally approved.
Mattis required a formal waiver to be eligible to serve, due to a requirement that a person be out of the armed services for at least seven years before being eligible to become Defence Secretary.
George W Bush v rain poncho
As Trump began his inauguration speech earlier, it started raining.
VIP guests put on their rain ponchos and opened umbrellas, but it looks like former US President George W Bush struggled a bit...
His former Vice-President Dick Cheney (sitting behind him) can't hide his amusement.
ReutersCopyright: Reuters
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Twitter warps fabric of internet
Twelve million tweets have been sent so far today on the #Inauguration.
Those posts peaked at 58,000 per minute at 12:02pm local time.
Trump's speech - 20 mins in 2.5 mins
It was 20 minutes long and touched on jobs, patriotism, rebuilding, radical Islam and winning. We have boiled it down to two and a half.
How conservatives rated Trump speech
PoolCopyright: Pool
Conservative commentators react to Trump's speech online.
Two new petitions have appeared on the White House website: one calling for an immediate "release of Trump's full tax returns", while the other one says the 45th president "should divest his financial and business holdings or have them administered by a truly blind trust".
Dem senator: Protesters 'disgusting'
Getty ImagesCopyright: Getty Images
Democratic Senator Claire McCaskill has some harsh words for the protesters causing damage around Washington DC.
“Nothing is more un-American than protesters who are not peaceful - disgusting,” tweeted McCaskill.
“I understand the angst out there today for all of you throwing stuff at me,” she added. "Sorry, but I believe peaceful protest is always the right way."
"In a combative political speech, which lasted about 15 minutes, right after taking the oath on the Bible, the 45th president of the United States promised to 'strengthen the old alliances and forge new ones,'" the paper stated.
Elsewhere, former President Nicolas Sarkozy has broken his social media silence to wish Barack Obama all the best.
It was Sarkozy's first tweet since he was defeated by ex-PM Francois Fillon in the first round of France's Republican presidential primary in November.
We are live streaming on the BBC News Instagram account at the back portion of the inaugural parade. Follow @BBCNews on Instagram and watch the live stream on your phone!
The president and first lady are heading towards their new home at 1600 Pennsylvania Avenue.
As is traditional during US presidential inaugurations, they walked some of the route, emerging briefly with their son, Barron, from the armoured vehicle known as The Beast.
Live Reporting
Max Matza and Yaroslav Lukov
All times stated are UK
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Latest PostTrump arrives at White House
Nineteen months after descending that golden escalator in the lobby of Trump Tower to launch his improbable bid for the White House, the new president strides into the grounds of 1600 Pennsylvania Avenue.
One of the most remarkable campaigns in living memory ends here, as he takes over as 45th commander-in-chief.
Keep track of his progress here with our handy Trump Tracker.
Trump's Secretary of Defence is confirmed
James "Mad Dog" Mattis has been confirmed by the Senate.
The retired Marine general is Trump's first nominee to be formally approved.
Mattis required a formal waiver to be eligible to serve, due to a requirement that a person be out of the armed services for at least seven years before being eligible to become Defence Secretary.
George W Bush v rain poncho
As Trump began his inauguration speech earlier, it started raining.
VIP guests put on their rain ponchos and opened umbrellas, but it looks like former US President George W Bush struggled a bit...
His former Vice-President Dick Cheney (sitting behind him) can't hide his amusement.
Twitter warps fabric of internet
Twelve million tweets have been sent so far today on the #Inauguration.
Those posts peaked at 58,000 per minute at 12:02pm local time.
Trump's speech - 20 mins in 2.5 mins
It was 20 minutes long and touched on jobs, patriotism, rebuilding, radical Islam and winning. We have boiled it down to two and a half.
How conservatives rated Trump speech
Conservative commentators react to Trump's speech online.
How conservatives rated Trump speech
Conservative commentators react to Trump's speech online.
Read moreScots protests against Trump
Hundreds of protesters taken place across Scotland to oppose the presidency of Donald Trump.
Scots protests against Trump presidency
Hundreds of protesters march in Scotland to oppose the presidency of Donald Trump.
Read moreNew petitions hit White House
Two new petitions have appeared on the White House website: one calling for an immediate "release of Trump's full tax returns", while the other one says the 45th president "should divest his financial and business holdings or have them administered by a truly blind trust".
Dem senator: Protesters 'disgusting'
Democratic Senator Claire McCaskill has some harsh words for the protesters causing damage around Washington DC.
“Nothing is more un-American than protesters who are not peaceful - disgusting,” tweeted McCaskill.
“I understand the angst out there today for all of you throwing stuff at me,” she added. "Sorry, but I believe peaceful protest is always the right way."
Protests across America
Anti-Trump demos have been held across the US.
'Flesh of slain animals'
Searches for "carnage" spiked after Trump used the word during his speech.
The Merriam-Webster dictionary helpfully points out that the earliest meaning in English of the word is: "the flesh of slain animals or men."
Limo ablaze in DC
A limousine that was vandalised earlier in the day by protesters is now fully ablaze.
Firefighters are now responding. There are multiple fires burning throughout the city, as President Trump leads a parade to the White House.
French media warily welcomes 'new era'
French media this evening has reflected what many in the world seem to be thinking - the Trump presidency will be a step into the unknown.
Respected daily Liberation said Trump's speech "remains entirely in line with his campaign statements".
"Calmer than usual, in a composed voice, this time Trump put on a presidential posture," it said.
Meanwhile, Le Parisien called Trump's speech "anti-elite, anti-decline and combative".
"In a combative political speech, which lasted about 15 minutes, right after taking the oath on the Bible, the 45th president of the United States promised to 'strengthen the old alliances and forge new ones,'" the paper stated.
Business daily Les Echos simply put it that "America has just entered a new era".
Elsewhere, former President Nicolas Sarkozy has broken his social media silence to wish Barack Obama all the best.
It was Sarkozy's first tweet since he was defeated by ex-PM Francois Fillon in the first round of France's Republican presidential primary in November.
Watch Trump's motorcade
Live streaming parade
We are live streaming on the BBC News Instagram account at the back portion of the inaugural parade. Follow @BBCNews on Instagram and watch the live stream on your phone!
Obama photographer shares departing images
Young men's messages
Children in Baton Rouge, Louisiana, have given their take on the transition of power.
"I don't think he's gonna lead the country right," one young man says of Trump.
Trump and Melania are on foot
The president and first lady are heading towards their new home at 1600 Pennsylvania Avenue.
As is traditional during US presidential inaugurations, they walked some of the route, emerging briefly with their son, Barron, from the armoured vehicle known as The Beast.
Protesters set fire outside Washington Post offices
Remember me?
Barack Obama has used his civilian Twitter account for the first time since becoming a former president.
His new bio simply calls him "Dad, husband, President, citizen".
And Michelle Obama got in on the act, too.