sentences:  Lubbers subsequently returned as a Member of the House of Representatives after Roelof Kruisinga was appointed as Minister of Defence in the Cabinet Van Agt–Wiegel, taking office on 22 December 1977 serving as a frontbencher.On 7 November 1978, the Parliamentary leader of the Christian Democratic Appeal in the House of Representatives Willem Aantjes resigned and Lubbers was selected as his successor as Parliamentary leader.After the election of 1981, the Leader of the Christian Democratic Appeal and incumbent Prime Minister Dries van Agt returned as Parliamentary leader on 10 June 1981 and following the cabinet formation of 1981 and the formation of the Cabinet Van Agt II, Lubbers again took over as Parliamentary leader on 24 Augustus 1981.