In the 1967 elections the KVP lost 15% of its votes and 8 seats. During the election campaign the KVP, ARP and CHU declared that they wanted to continue cooperating with each other. Cooperation with the PvdA was much less important. This led to unrest under young and left wing KVP supporters, including Ruud Lubbers, Jo Cals, Erik Jurgens and Jacques Aarden, who called themselves Christian Radicals. After the elections this promise was upheld and the KVP formed a cabinet with its old partners, led by Piet de Jong. After much debate some of the Christian Radicals broke away from the KVP in 1968 to form the Political Party of Radicals (PPR). These include three members of parliament, who form their own parliamentary party Groep Aarden. Lubbers and Cals stayed with the KVP. The new party became a close partner of the PvdA. In the 1971 elections the KVP lost another 7 seats (18% of its vote). The KVP again joined the ARP, CHU and VVD to form a new centre-right cabinet with rightwing dissenters of the PvdA, united in DS'70. The ARP's Barend Biesheuvel led the cabinet. In 1972 the cabinet fell because of internal problems of the junior partner, DS'70.