Here is a timeline of the key events leading up to and during Donald Trump’s first 100 days as US president.
2016
:: November 9
Billionaire businessman Donald J Trump is elected as president of the United States, beating the Democrat candidate and former secretary of state Hillary Clinton.
:: December 19
Mr Trump surpasses 270 votes in the US Electoral College to formally win the presidency, despite protests and pressure from thousands of voters to abandon him.
:: January 6
After meeting with intelligence officials, the president-elect says that alleged hacking by Russia had “absolutely no effect” on the outcome of the US election.
:: January 8
Foreign Secretary Boris Johnson flies to New York for talks with key members of Mr Trump’s team.
:: January 11
The property tycoon announces he is voluntarily handing over control of his business empire to his two sons Donald Jr and Eric.
On the same day, US media report on the circulation among top officials of a dossier containing lurid allegations about Mr Trump. The document was compiled by a British former MI6 agent and denounced on Twitter by the then president-elect as “FAKE NEWS”.
:: January 20
Large crowds watch as the reality TV star is sworn in as the 45th president before he delivers an inauguration speech in which he says the date will be remembered as “the day the people became the rulers of this nation again”.
::January 21
Mr Trump accuses the media of lying about the size of the Inauguration Day crowd, which he said was up to half a million and backed up to the Washington Monument. Photos and public transport data suggest otherwise.
:: January 24
The president signs executive actions to advance the construction of the Keystone XL and Dakota Access oil pipelines, which opponents claimed could undercut a global climate change deal and affect drinking water and Native American cultural sites.
:: January 25
Mr Trump signs immigration actions to build a border wall, saying: “We’ve been talking about this right from the beginning.”
:: January 26
Mexican president Enrique Pena Nieto cancels a trip to Washington and a few hours later Mr Trump calls for a 20% tax on imports from Mexico to pay for the southern border wall.
:: January 27
Prime Minister Theresa May becomes the first foreign leader to meet the president for talks just a week after his inauguration.
In a joint press conference at the White House, the pair hail the US-UK “special relationship” and Mrs May says Mr Trump has accepted an invitation from the Queen for the president to make a state visit to Britain later this year.
Just hours later, the president signs an executive order for “new vetting measures”, barring those fleeing from Syria indefinitely and imposing a 90-day ban on entry to the US for people from seven Muslim-majority nations. He says the decision is to keep “radical Islamic terrorists” out of the country.
:: January 29
Mrs May’s spokesman says she does “not agree” with the refugee ban and will make representations if it affects Britons.
:: January 30
A petition calling for Mr Trump’s state visit to the UK to be cancelled reaches one million signatures. Mrs May responds that the Government “looks forward“ to hosting him.
:: February 4
The US state department is forced to reverse visa cancellations for up to 60,000 foreigners after a federal judge blocks Mr Trump’s travel ban.
:: February 5:
The Justice Department appeals against a court ruling blocking Mr Trump’s travel ban, with the president saying aliens have “no constitutional rights“ to enter the US.
:: February 6
Commons Speaker John Bercow tells MPs the travel ban has made him “even more strongly” opposed to President Trump addressing both Houses of Parliament during his state visit, saying it is “not an automatic right, it is an earned honour”.
:: February 9
A US appeals court refuses to reinstate the ban on travellers from seven Muslim-majority nations. The president tweets: “SEE YOU IN COURT”.
:: February 16
The Trump administration says it will revise its travel ban order, and will not pursue an appeals court review.
:: March 15
A judge in Hawaii puts the revised federal travel ban, which lifted restrictions on Iraqi citizens, on hold.
:: March 16
White House press secretary Sean Spicer repeats allegations made by a former judge on Fox News TV that former president Barack Obama used Britain’s surveillance agency GCHQ to spy on Mr Trump before he became president.
In a break with convention, the listening post dismissed the claims as “nonsense” and “utterly ridiculous”.
:: March 17
The White House assures the UK Government that allegations that GCHQ spied on Mr Trump will not be repeated.
:: March 20
FBI director James Comey confirms the agency is investigating possible co-ordination between President Trump’s associates and Russia.
:: March 28
Mr Trump signs an executive order rolling back Mr Obama’s efforts to combat climate change.
:: March 31
A US judge rules the president must pay 25 million dollars (£20 million) to settle lawsuits over Trump University, ending years of litigation.
:: April 4
President Trump blames Syrian president Bashar Assad’s regime for a chemical attack which left nearly 90 people dead, including civilians, in Khan Sheikhoun in Syria.
:: April 7
The president orders a barrage of 59 cruise missiles targeting an airbase on Syria in retaliation for the chemical weapons attack. The British Government says it “fully supports” the US action, which it says “is intended to deter further attacks”.
:: April 10
Mrs May telephones Mr Trump and is thanked for her support over the air strikes. The leaders agree a “window of opportunity now exists” in which to persuade Russia to abandon Assad.
:: April 12
Russia vetoes a UN resolution condemning the chemical weapons attack and calling for an international probe. Mr Trump says the US is “not getting along with Russia at all”, and relations are at an “all-time low”.
The president also says in a television interview that he made the decision to launch the retaliatory air strikes while eating “the most beautiful piece of chocolate cake” as he dined with China’s president Xi Jinping.
:: April 13
The largest non-nuclear weapon ever used in combat by the US military, known as a massive ordnance air blast (MOAB) weapon and dubbed the “mother of all bombs”, is dropped on IS caves in Nangarhar province in Afghanistan.
:: April 17
Mr Trump warns North Korea it has “gotta behave” a day after the isolated nation’s failed medium-range missile test. His intervention came after a North Korean ambassador accused the US of creating a scenario in which “thermonuclear war may break out at any moment”.
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