Minister for Foreign Affairs Simon Coveney has urged Iran to come back to the table on the 2015 landmark nuclear deal.
Simon Coveney is in Tehran and today met Iranian President Hassan Rouhani, as well as the country's Foreign Minister as part of Ireland's two-year term on the UN Security Council.
One of Ireland's responsibilities is as facilitator of the nuclear deal between Iran, the US, the UK, Russia, France, China and Germany.
The deal has been floundering since the Trump administration walked away but Minister Coveney said his message to the Iranian President today was to be open to talking to the new US administration.
Afterwards the minister said: "The meeting went very well. I outlined the opportunity now to recommit to the JCPOA, but I emphasised the need for a willingness to engage with the new US administration on the steps necessary."
On Friday night Mr Zarif indicated on Twitter that Iran will soon present a "constructive" plan of action, with European sources suggesting there were positive signs that Tehran could open informal talks about its nuclear programme.
Minister Coveney said in a statement ahead of the trip that Ireland is keen to maintain a close dialogue with all actors, and encourages all parties to return to full compliance with the 2015 nuclear agreement.
Opposition group the National Council of Resistance of Iran said it did not support the trip stating that it emboldened the regime that suppresses Iran's people.
In a statement it said: "All relations with the Iranian regime must be predicated on improvement in human rights and a halt to executions."