Masyumi Party
On 20 August 1959, President Sukarno exercised his prerogative by appointing Mohammad Natsir to become a cabinet formation. The Natsir's Cabinet was a coalition cabinet with Masyumi Party's as it core. However, the PNI did not get a position in this cabinet, most of the member of this party consists of Masyumi Party people, although there were non-party members in the cabinet. This cabinet was where well-known professional figures sit in it, such as Sri Sultan Hamengkubuwana IX, Ir. Djuanda and Prof. Dr. Sumitro Djojohadikusumo. It is why the cabinet got the epithet 'Zaken Cabinet'. Natsir motive was to lead a nationalistic cabinet with coalition parties as the members. However, this cannot be fulfilled because there was a fight for seat formation in the cabinet between PNI and Masyumi Party, causing displeasure from PNI's side and difficulty in pursuing PNI to join his cabinet. In this case, Natsir reasoned that his party had more rights than any other party, yet on the other hand, the PNI did not agree with this because, for them, all parties were entitled to a position in the cabinet. PNI demanded that people from their party got the position as Ministry of Home Affairs, Ministry of Foreign Affairs, and Ministry of Education. After negotiating, PNI were willing to give up the position of Ministry of Foreign Affairs to Masyumi and Ministry of Education for another party with the promise of taking the position as Ministry of Home Affairs. Yet, the hope of getting that position had to crumble after it was decided that Masyumi must take the position. PNI conceded this unfair considering the position of Prime Minister itself already filled with Masyumi.