Washington (CNN) As Brexit negotiations continue in the United Kingdom, President Donald Trump weighed in during an Oval Office meeting Thursday with Irish Prime Minister Leo Varadkar, claiming British Prime Minister Theresa May did not listen to his negotiating advice.

"I can tell you it's a very complex thing that's going on right now," Trump said, adding, "It's tearing a lot of countries apart. And it's a shame it has to be that way. I think we will stay right in our lane. We're doing fantastically as a country. Our economy is booming. We're the envy of the world. Other economies are not doing well."

Trump also repeated falsehoods he's made before Thursday when he said he was not a supporter of Brexit.

"I was right and people laughed when I predicted it," he said, recalling a 2016 news conference at his Scottish golf course.

Trump's news conference at his Turnberry golf course in Scotland took place the day after the Brexit referendum -- once the results were already known. In a Fox News interview before the referendum, Trump recommended UK voters vote to leave Brexit.

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