The Taoiseach and the US President will meet at a gala dinner in Washington DC this evening.
It's a rare attendance at the Ireland Funds dinner for a US President with Biden expected to address a group of mostly wealthy ex-pats.
Micheál Martin and the President will meet at the function ahead of their formal bilateral at the White House tomorrow.
The Taoiseach has said one big issue for him is the undocumented Irish.
