The European Parliament's Brexit co-ordinator is in Dublin this morning to meet the Taoiseach and address a joint sitting of the Oireachtas.
Guy Verhofstadt has been on a tour of Belfast and the border counties and says a hard border would be a disaster for Ireland.
His role in the Brexit deal is essential as the European Parliament will have a binding vote on the final deal.
Speaking yesterday, Mr Verhofstadt said that the UK is engaged in an "internal battle" over its Brexit position.
He also stated that talks are not going well and Britain's position is not clear enough.
He warned the outcome needed to be positive for both sides as the UK and EU gear up for a fourth round of negotiations next week following Theresa May's major speech in Florence on Friday.
Mr Verhofstadt said: "We feel, hopefully I am wrong, that we don't receive always a clear UK position.
"There is still internal battle in UK about what is their position, what they want.
"For us there was not a problem, there was a single market, a customs union, no one was complaining about that, but by leaving all these points come back."