A Downing Street spokesperson said:
“The Prime Minister spoke with Taoiseach Leo Varadkar on the phone this afternoon.
“They both agreed about the paramount importance of no hard border or physical infrastructure at the border between Ireland and Northern Ireland. The Prime Minister said how she recognised the significance of this issue to the people of Northern Ireland and Ireland and how this remained a joint priority for both Governments, and the EU, to resolve.
“The Prime Minister said we are working hard to find a specific solution to the unique circumstances in Northern Ireland that respects the integrity of the UK, the European Union and the Belfast Agreement.
“She added that we are committed to moving together to achieve a positive result on this as well as restoring devolved Government to Northern Ireland. Both leaders looked forward to continuing relations as close neighbours and allies as the negotiations progress.”