US President Donald Trump is in Ireland as part of a two-day visit to the country
He has landed at Shannon Airport, and is on his way to his golf resort in Doonbeg, County Clare, where the Irish Open golf tournament is being held
Asked earlier by reporters about the prospect of a united Ireland, Trump said he doesn't want to "cause any problems" but thinks it would be a "great thing", adding: "I'd love to see it unified"
No 10 has responded to the remarks, while the Democratic Unionist Party says Northern Ireland's constitutional future "won't be decided by commentary in London, Dublin or Washington"
Trump held separate meetings earlier with Taoiseach (Irish Prime Minister) Micheál Martin and Irish President Catherine Connolly
Traffic is at a standstill in parts of Dublin city centre as a protest with more than 10,000 people made its way through the Irish capital
Trump's comments could be more than just a random, off-the-cuff remark ahead of the US midterm elections, writes our correspondent
Image source, ReutersAfter the guard of honour, Irish President Catherine Connolly introduced President Donald Trump to a number of Irish dignitaries.
The US side then did the same, with Connolly shaking hands with a number of people including Trump's son Donald Trump Jr.
The two presidents then returned inside for a private courtesy call between the two.
Both President Trump and President Catherine Connolly have now come back out of Áras an Uachtaráin.
The national anthems of both the United States and the Republic of Ireland were played, with Trump given a guard of honour by members of the Irish military.
Chris Page
BBC News Ireland correspondent
Image source, ReutersDonald Trump’s first port of call is the residence of Irish President Catherine Connolly.
Her role is largely ceremonial, but that’s the part of the visit which might have a bit of diplomatic jeopardy, because she is a long-standing critic of US foreign policy and military action in the Middle East.
In her election campaign last year, where she was backed by a coalition of left-wing parties, she said Mr Trump was acting like a bully.
We've just seen Donald Trump being greeted with Irish President Catherine Connolly after arriving at her official residence.
They then went into the president's residence.
Here's a reminder of the relationship between the two, who have very different political outlooks.
Image source, Getty Images
Image source, ReutersDonald Trump has now arrived at Áras an Uachtaráin for his meeting with Irish President Catherine Connolly.
We've just seen his motorcade arrive and the president step out of his vehicle.
President Trump's motorcade has arrived at Áras an Uachtaráin in Phoenix Park for the arrival ceremony, with Irish President Catherine Connolly ready to greet him.
You can watch the arrival ceremony by pressing watch live at the top of this page.
Image source, PA MediaAs a reminder, Donald Trump is now making his way to Áras an Uachtaráin in Phoenix Park - the official residence of the Irish President Catherine Connolly.
She has been pictured waiting for his arrival.
Earlier, the military band was also seen marching into position.
Image source, PA Media
Image source, PA MediaTrump arrives at Dublin Airport on Air Force One
Let's recap some of the scenes we've seen this morning at the start of Donald Trump's visit to Ireland.
The president was seen stepping off Air Force One before being greeted with a red carpet welcome from officials, including Tánaiste (Irish Deputy Prime Minister) Simon Harris.
Image source, ReutersTrump salutes as he is greeted after disembarking
Image source, ReutersTrump is greeted by Tánaiste (Irish Deputy Prime Minister) Simon Harris
Image source, ReutersA red carpet welcome for the president and members of his family, including Donald Trump Jr
Image source, PA MediaOne of President Trump’s more interesting events today could be the courtesy call with Irish President Catherine Connolly.
She is due to greet him at shortly at Ireland's presidential residence Áras an Uachtaráin.
The two have very different political outlooks.
During last year’s presidential election campaign, Connolly described Trump as “volatile, unpredictable” and accused him of “acting like a bully”.
She has also been a long-standing critic of US foreign policy and the use of Shannon Airport by the US military.
Connolly has been less directly critical of Trump since becoming president, but has continued to speak strongly about war and international law.
Today’s courtesy call will be their first meeting since she took office last November.
As President Trump makes his way to Phoenix Park in Dublin for the arrival ceremony, a reminder that a huge security operation is in place for his visit.
The head of Ireland's police force, Garda Commissioner Justin Kelly, has described it as one of the biggest operations the force has ever undertaken.
He spoke to journalists at a press conference on Friday morning.
An extraordinary event has been declared, with 10,000 12-hour Garda shifts planned between Friday and Sunday.
Road closures and traffic restrictions will be in place in Dublin and County Clare, where the president is due to travel later on Saturday, with rolling closures around Dublin Airport this morning.
“We’re doing everything we can to minimise disruption to the public but during an event such as this, it is inevitable so I would ask for people’s patience over the weekend particularly in Dublin and Clare."
Gardaí say they are aware of protest groups planning to gather and will facilitate peaceful protests, but added "there will be no tolerance for public disorder, or attempts to impact critical infrastructure or movements of the President of the United States”.
President Trump's cavalcade has now left Dublin Airport and is making its way to Áras an Uachtaráin in Phoenix Park - the official residence of the Irish president.
An arrival ceremony is scheduled to take place there, before Trump holds a courtesy call with President Catherine Connolly.
He will later make the short journey to Farmleigh House, also in Phoenix Park, for a bilateral meeting with Taoiseach (Irish Prime Minister) Micheál Martin.
Image source, bbcDonald Trump shook hands with senior Irish government figures as he was welcomed on the tarmac, including Tánaiste (Irish deputy prime minister) Simon Harris, Foreign Minister Helen McEntee and the US ambassador to Ireland Ed Walsh.
The US president then got into the presidential limousine, nicknamed The Beast, which was flanked by a large cavalcade of vehicles.
Image source, ReutersDonald Trump has just been seen stepping off Air Force One after arriving at Dublin Airport a few moments ago.
It marks the start of his two-day visit which will include a courtesy call with Irish President Catherine Connolly as well as a bilateral meeting with Taoiseach (Irish Prime Minister) Micheál Martin.
He'll later travel to County Clare to attend the Irish Open golf tournament.
Image source, ReutersThe president's plane is now parked and the red carpet is being prepared for his arrival onto the tarmac in Dublin.
Tánaiste (Irish deputy prime minister) Simon Harris and Irish Foreign Minister Helen McEntee are among those waiting to greet him off the plane.
You can watch the president's arrival live by hitting the play button at the top of this page.
Image source, Reuters
Image source, PA MediaDonald Trump touches down at Dublin Airport
Donald Trump's plane has just touched down at Dublin Airport.
He's travelling on the Qatar-gifted Air Force One. Earlier, we also saw the old Air Force One land.
Mark Simpson
BBC News NI
A small number of crowd control barriers are beside the American Embassy in central Dublin but President Trump is not scheduled to be anywhere near the building.
Located in the upmarket Ballsbridge area of the city, it is not on the President’s two-day itinerary.
US President Donald Trump is about to touch down at Dublin Airport for the start of his two-day visit to Ireland.
The tyres of the old Air Force One, which is landing before the plane carrying the president, kicked up a decent bit of spray as they hit the tarmac, evidence of a wet and rainy start to the day in Ireland's capital.
Image source, PA MediaWe can now bring you pictures of police motorcycles at Dublin Airport.
These are expected to form part of the motorcade once US President Donald Trump arrives.
Security and cars could also be seen on the tarmac.
The president is due to arrive very shortly.
Image source, PA Media
Image source, EPAThe Irish Defence Forces are supporting the operation
As you might expect, a major security operation is under way for Donald Trump’s visit.
Dublin’s Phoenix Park is closed to the public today while the US president carries out a number of engagements in the area.
The huge park, which incorporates the Irish president's residence Áras an Uachtaráin, is also the location of Dublin Zoo, which is likewise closed today.
Very significant Garda (Irish Police) resources have been allocated to policing the visit.
The Irish Defence Forces are supporting the operation, while gardaí have also been working with the US Secret Service ahead of this weekend.
Image source, Getty ImagesPictured above is US President Donald Trump boarding Air Force One last night ahead of his trip to Ireland.
Members of his family could also be seen boarding with him at the Joint Base Andrews air base in Maryland.
We haven't had word of his arrival in Dublin yet - stick with us for updates.