US President Joe Biden has referenced his Irish roots in a video welcoming newly sworn-in citizens of the United States.

In the recording, which was released today, Mr Biden said that America can be defined in one word, "possibilities".

"That very idea has been nurtured, enriched and advanced by the contributions sacrifices and dreams of immigrants like you and immigrants like my own ancestors from Ireland," he said.

The US President also thanked the new citizens for choosing the United States.

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"You all have one thing in common - courage. The courage it takes to sacrifice and make this journey. The courage to leave your homes, your lives, your loved ones, and come to a nation that is more than just a place but rather an idea," Mr Biden said.

"Today you've earned a new title equal to that of an American president, the title I'm most proud of - citizen. Citizen of the United States of America," he added.

Presidents typically record a message to be played at the end of naturalisation ceremonies after new citizens take the oath of allegiance.

Those events however have been scaled back because of the coronavirus pandemic.

The White House and US Citizenship and Immigration Services released the president's video message publicly so that it can be viewed by new citizens from home.