dublin ireland might consider add elements text agreement post-brexit future northern ireland border long undermine already contain deal irish time report tuesday british prime minister theresa may find difficult come formula satisfy eu member ireland want avoid creation hard border northern ireland democratic unionist party dup say british province must quit eu term rest uk dup prop may minority government tentative deal border promise regulatory alignment side island ireland agree monday late reject dup say allow divergence regulation northern ireland part uk brussels say agreement need give green light britain begin talk future free trade european union leaders meet next week irish time quote spokesman irish prime minister leo varadkar say add elements assuage concern dup seem unreasonable possibility irish time suggest element might refer strength uk political entity ask comment report spokesman varadkar say view irish government term deal reach monday must stand uk government work dup propose move forward spokesman add ireland might consider add brexit border text irish time