Mr Trump made the comments during a press conference with Irish Prime Minister Leo Varadkar in the Oval Office yesterday.
In 1952, Ireland's ambassador to the United States, John Hearne, sent a small box of shamrocks to US President Harry Truman, unknowingly creating a tradition that is still carried out 66 years later.
Following meetings with businesses leaders, community leaders and members of the Irish diaspora, Mr Varadkar addressed an audience on Wednesday as part of his engagements in the USA capital.
"It wasn't that I was a supporter".
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He said: "I'm surprised at how badly it's all gone from the standpoint of a negotiation".
"People often ask me what I felt on Inauguration Day when I raised my right hand", Pence said.
The Irish PM said the most pressing issue facing his country was how to settle questions about the future of the border between Ireland, an European Union member, and Northern Ireland, which won't be.
Speaking on stage, US Chamber of Commerce chief executive Tom Donohue said that Ireland was able to improve its economy and employment because "it stuck to its tax rates".
Varadkar, who was Ireland's health minister at the time, publicly announced his sexual orientation in a radio interview earlier that year, describing it as "part of my character, I suppose".
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We have to prepare more and we have reserved policy room [to address uncertainties]", Li told a news conference after the annual parliament meeting ended.
"We talked about Brexit, something that is turning out to be a little more complex than they thought it would be. We're going to tariff a lot of their products coming in because the European Union treats us very, very unfairly", he said.
US President Donald Trump said on Thursday that he was "surprised at how badly" the Brexit negotiations have gone.
After the meeting, the prime minster said he appreciated the opportunity to lay out Ireland's position on Brexit.
Taoiseach Leo Varadkar and partner Matt Barrett meet US Vice-President Mike Pence and his wife Karen.
The two leaders spoke in glowing terms about one another, with Trump stating that he and Varadkar have become "fast friends".
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Mr Trump was due to visit the Republic of Ireland past year, but it was cancelled for "scheduling reasons". "It's a special place".
Trump had said he expected to hold a summit with Xi Jinping late this month at his Florida golf resort.
Afterwards Mr Varadkar said he had a "really good meeting" with President Trump.
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What bugs Windows 10 users the most, however, is having no ability to pause Windows 10 updates. With that being the case, the new 35 day installation delay looks likely to stay in place.