"In a no-deal scenario, the UK won't have any trade deals with anyone, and I think it will be very difficult for them to conclude any trade deals with the question of the Irish border unresolved," RTE's Tony Connelly quoted Varadkar on Twitter as telling reporters in Davos.

"Given we have a solution on the table already, let's ratify that."

(Reporting by Padraic Halpin; editing by John Stonestreet)