belfast head northern ireland democratic unionist party prop british prime minister theresa may government friday call brexit transition period keep minimum accuse eu try damage britain anti-eu comment since agree 10 members parliament would support may arlene foster say statement believe aggressive eu negotiators ... seem determine much damage uk dup campaign leave european union last year referendum 56 percent northern ireland voters support remain foster tend shy away hard brexit position northern ireland widely see region lose customs barriers introduce britain eu foster describe may friday speech florence call britain stay single market current term around two years positive vision transition period absolute minimum period say wish express referendum deliver without undue delay dup leader say brexit transition keep 'absolute minimum