Rehn's appointment to the enlargement post was seen as a slight disappointment for Finland, who had hoped for their nominee to be given a portfolio relating to economic issues. Enlargement was a central issue for the EU in the run-up to the landmark accession of ten countries on 1 May 2004, but has since declined in importance, if only slightly. Rehn presided over the accession of Bulgaria and Romania in 2007, as well as continuing negotiations with Croatia and opening them with Turkey, the latter being perhaps the most significant and the most hotly debated future accession.