Leo Varadkar is meeting Theresa May today, where Brexit will top the agenda.
The Taoiseach is meeting the British prime minister on the sidelines of an EU summit in Sweden.
He's expected to emphasise the importance of upholding all aspects of the Good Friday Agreement, and tell Mrs May he won't accept a hard Northern Irish border under any circumstances.
This meeting comes ahead of a European Council meeting in December - where a decision will be taken on whether or not to move forward with the Brexit talks.
Meanwhile, Foreign Affairs Minister Simon Coveney will meet the British Foreign Secretary Boris Johnson at Iveagh House.
They'll hold official talks, with Brexit again expected to top the agenda - alongside human rights, Africa and the Middle East.