Story highlights President Joe Biden will caution the U.S.'s British allies during remarks in Ireland on Friday

Biden said earlier he and President Barack Obama had wished for a different outcome

Palo Alto, California (CNN) Instability in Europe and beyond is providing "fertile terrain for reactionary politicians and demagogues," Vice President Joe Biden cautioned during remarks in Ireland on Friday.

Listing global irritants like mass migration, terrorism, climate change, Biden said those factors are leading to leaders "peddling xenophobia, nationalism, and isolationism," including in the United States.

"To play to our fears rather than, as Abraham Lincoln said, to appeal to our better angels, build walls instead of bridges -- it has been un-American what we have been seeing," Biden said in Dublin. "It's not who we have become. It is not who we are."

Biden's remarks came as the world reacts to the United Kingdom's vote to exit the European Union. He warned against global trends toward nationalism "in Europe and other parts of the world."

Earlier Friday, Biden said the U.S. "respects" the UK's decision, but admitted he and President Barack Obama had wished for a different outcome.

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