US Vice President Mike Pence (photo, above) used a visit to Ireland on Tuesday to urge the European Union to negotiate “in good faith” with British Prime Minister Boris Johnson and reach a Brexit deal that respects British sovereignty.

The outcome of Brexit remains uncertain three years on from the vote to leave the bloc, with disagreement on how to keep EU member Ireland’s border with Northern Ireland open and not jeopardize two decades of peace in the British-run region.