In his speech in Dundalk, Mr Biden stated his ancestors left Eire at about the identical time as former US President Barack Obama’s great-great-great-grandfather Falmouth Kearney, who was from Moneygall in County Offaly.
“They’d by no means have dreamed that their grandsons would have been presidents of the USA,” he stated.
Mr Biden was given a tour of Carlingford Fortress alongside the Tánaiste (Irish Deputy Prime Minister) Micheál Martin.
Requested about his emotions on the go to, the president replied: “It is fantastic. It appears like I am coming dwelling.”
Commenting on the moist climate, he added: “It is high-quality – it is Eire.”