Donald Trump has started his visit to Ireland by comparing its post-Brexit border with Northern Ireland to the US border with Mexico, along which he wants to build a permanent wall.

Trump, sitting next to a visibly uncomfortable taoiseach, Leo Varadkar, waded into the Brexit debate minutes after Air Force One touched down at Shannon airport on Wednesday afternoon.

“I think it will all work out very well, and also for you with your wall, your border,” he said at a joint press conference. “I mean, we have a border situation in the United States, and you have one over here. But I hear it’s going to work out very well here.”



Varadkar interjected that Ireland wished to avoid a border or a wall, a keystone of Irish government policy.



“I think you do, I think you do,” Trump said. “The way it works now is good, you want to try and to keep it that way. I know that’s a big point of contention with respect to Brexit. I’m sure it’s going to work out very well. I know they’re focused very heavily on it.”

In London on Tuesday Trump met the Brexiter politicians Nigel Farage, Iain Duncan Smith and Owen Paterson, all of whom have played down the idea that the border between Ireland and Northern Ireland will be a problem after the UK leaves the EU.

Trump echoed their confidence in Shannon. “There are a lot of good minds thinking about how to do it and it’s going to be just fine. It ultimately could even be very, very good for Ireland. The border will work out.”

The Irish government has mounted an intense, three-year diplomatic effort arguing the opposite, that Brexit threatens peace and prosperity on the island of Ireland.

The US president’s comments were an awkward start to what is expected to be a low-key end to his visit to Europe, with much of his time spent at his golf and hotel resort in Doonbeg, County Clare. From Shannon airport he took a short helicopter ride to his resort on the Atlantic coast.

Addressing the media after Trump’s departure, Varadkar said he explained the history of the border and the Troubles in their private meeting. “We talked Brexit. President Trump shares our objective to keep the border open.” He said Trump had not elaborated on why he thought Brexit could benefit Ireland.

The two leaders also discussed trade, visas and taxes paid by US corporations with operations in Ireland.

The Irish president, Michael D Higgins, made an unexpected intervention on the eve of the visit by calling Trump’s policy on the climate emergency “regressive and pernicious”, a critique protesters will echo at rallies in Shannon and Dublin.

Trump told reporters he was unaware of Higgins’ comments and reiterated that the US had enjoyed cleaner air and water since he became president, a claim he also made in London.

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After three days of pomp, pageantry and politics during his state visit to Britain, Trump and his entourage, which includes his wife, Melania, and his four adult children, will be mostly out of the public gaze in the remote, windswept landscape of Loop Head peninsula.

On Thursday, Trump will travel to France for D-day commemorations before returning to Doonbeg, where he is due to play a round of golf on Friday before flying home.

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The Irish police deployed 1,500 uniformed officers plus 500 members of specialised units, including divers and armed and air support, to secure Shannon airport and Doonbeg.

Trump’s 162-hectare (400 acre) resort was in lockdown and closed to the public. Newly installed surveillance cameras with night-vision capability fed images to a police control room.

Roads to the adjacent village of Doonbeg remained open. Locals have erected US flags and expressed hope Trump would visit one of their pubs, despite him being teetotal.

The resort employs more than 300 people during summer and is an economic lifeline for the region. Fr Joe Haugh, the parish priest, said: “The people are 99.9% behind him.”

Elsewhere, there were protests by individuals and groups opposed to the US president’s record on the environment and the rights of women, immigrants, ethnic minorities and LGBT people.

Demonstrators set up a “peace camp” outside Shannon airport, and the Trump blimp used by protesters in London was due to appear at a rally in Dublin on Thursday.

The visit has created a political and diplomatic challenge for the Irish government. Trump is not popular in Ireland. Varadkar reportedly asked to have the meeting at Shannon airport, a neutral venue, rather than in Trump’s resort.

The hosts, however, are keen to lobby the US president over trade, visas for Irish workers and support for the peace process. They also want to explain the potential impact of Brexit on the border and try to placate Trump over Ireland’s low-tax regime and use of Huawei technology in the new 5G network.

Simon Coveney, the Irish foreign minister, sought a delicate balance when asked about Higgins’ criticism of Trump’s climate policies. The Irish president caught the mood of the Irish people quite well, he told RTÉ, but regressive was “a better adjective” than pernicious.

The hosts will be hoping Trump does not broach a source of personal irritation. Environmental objections have stalled a sea barrier he wishes to build to protect his resort from erosion. The US president has described the battle as an “unpleasant experience”.