Biden made the gaffe when paying tribute to distant relative and former Ireland Test rugby player Rob Kearney.
Speaking at the Windsor Bar in Dundalk, Biden thanked Kearney for the tie he was wearing. He also brought up the famous 2016 Ireland victory over the All Blacks at Soldier Field in Chicago.
"This was given to me by one of these guys, right here, was a hell of a rugby player. He beat the hell out of the Black and Tans," the 80-year-old president said.
