sentences:  Following several failed cabinet formation attempts Den Uyl stepped down as Formateur and was replaced by Member of the Senate Wil Albeda of the Anti-Revolutionary Party as Informateur.Following two more failed cabinet formation attempts the Leader of the Christian Democratic Appeal Dries van Agt struck a deal with the Leader of the People's Party for Freedom and Democracy Hans Wiegel that resulted in a coalition agreement which formed the Van Agt–Wiegel cabinet, the Cabinet Den Uyl was replaced by the Cabinet Van Agt-Wiegel on 19 December 1977 and Den Uyl subsequently returned as a Member of the House of Representatives and as Parliamentary leader in the House of Representatives after the resignation of Kees van den Anker, taking office on 16 January 1978 and served again as Opposition leader.Den Uyl also served as President of the Party of European Socialists from 8 March 1980 until 19 May 1987.