On 25 March 1960, İsmet İnönü, the leader of CHP tried to visit
Kayseri as a part of his
election campaign. But his train was stopped in
Yeşilhisar town. This caused nationwide protests. DP deputies however published a notice claiming that CHP was preparing a rebellion. On 27 April DP parliamentary group which held the majority in the parliament passed a law to form a committee of Inquest. The committee, all members of which were DP MPs was tasked with inquires about the opposition party (CHP) and the press. The political committee was authorized like a court, including imprisonment. The chairman of the committee was Ahmet Hamdi Sancar and the committee was nicknamed as "Sancar’s committee". The first decision of the committee was to ban the political activities and to precensor the press. But İnönü continued to oppose the committee. He noted that the principle of
separation of powers was violated. ==28 April demonstrations==