Taoiseach Leo Varadkar of Ireland, President Donald Trump, First Lady Melania Trump, and Vice President Mike Pence pose for a photo during the Shamrock Bowl Presentation with Prime Minister of Ireland Leo Varadkar on March 14, 2019 at the White House in Washington, DC.
The visit by Irish dignitaries included a Friends of Ireland luncheon on Capitol Hill with President Donald Trump, where Trump and Varadkar discussed Brexit and Trump reaffirmed the strength of the US-Ireland relationship.
"I think what we offer is certainty that even though there may be changes in Government, even though we may go through different economic cycles of recession or growth, that is a certainty and I think that gives investors or potential investors that certainty you need if you're making the 20 or 30-year multibillion-euro investment in an economy".
Asked whether he thinks the United Kingdom should push back its exit date, Trump said: "I think they're probably going to have to do something, because right now they're in the midst of a very short period of time - the end of the month - and they're not going to be able to do that".
On the prospect of another referendum, he said: 'I don't think another vote would be possible because it would be very unfair to the people that won.
Varadkar's visit came as the White House is celebrating the annual St. Patrick's Day, a holiday that honors Irish culture.
"If they don't talk to us we're going to do something that's very severe economically", Trump said.More news: Jazz owner Miller: 'We're not a racist community'
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Turning to Mr Varadkar, he said: "Leo, I'm sure you agree on that".
He also said another vote on Brexit would be unfair, and reiterated that he would like to see a US trade deal with the United Kingdom after it leaves the EU.
Asked his view of the Brexit mess, Varadkar took a contrary view.
"It wasn't that I was a supporter. But I think it could have been negotiated in a different manner, frankly". "He does great work at Northwestern Memorial Hospital in Chicago", the vice president said to applause.
"I look forward to talking to you later about Brexit, giving you our perspective on it and the real importance of protecting the Good Friday Agreement and the really hard-won peace in Northern Ireland", Varadkar told Trump, referring to the 1998 British-Irish peace accord.
Mr Varadkar also said the leaders spoke about the issue of the undocumented Irish in the US.
Pence tweeted that he was honored to host Varadkar at his home.