PARIS (Reuters) - Britain must find concrete proposals to tackle issues concerning the border between the United Kingdom and Ireland in the wake of Brexit, said French President Emmanuel Macron during a news conference with Irish Prime Minister Leo Varadkar.  It s up to the UK to come up with concrete proposals to minimize the impact of Brexit on the British/Irish border,  said Macron on Tuesday. Earlier this month, Varadkar had said Ireland wanted Britain to commit to a fallback option that would avoid a customs border returning to the island of Ireland, should its plan of keeping the closest possible ties with the EU fall through. 
Up to UK to find concrete proposals over Brexit/Irish border issues: Macron