 Its former members became increasingly displeased with Tsarist control of military and governmental affairs and demanded its own reinstatement.When the Tsar refused its call for the replacement of his cabinet on 21 August with a "Ministry of National Confidence", roughly half of the deputies formed a "Progressive Bloc", which in 1917 became a focal point of political resistance.On 3 September 1915 the Duma prorogued.