Boris Stürmer was attacked by Milyukov in the Imperial Duma. The Progressist Party left the Bloc after demanding for a responsible government. Stürmer and Alexander Protopopov (his unexpected appointment was seen as a provocation designed to split the Bloc) asked in vain for the dissolution of the Duma. Alexander Guchkov reported that five members of the Progressive Bloc, including Kerensky, Aleksandr Konovalov, Nikolai Vissarionovich Nekrasov and Mikhail Tereschenko would consider a coup d'etat, but did not undertake any action. Grand Duke Nikolai refused to cooperate, saying that the army would not support a coup. The Progressive Bloc supported a resolution that the Tsar was to be replaced by his son Tsarevich Alexei. The new prime minister Alexander Trepov offered to satisfy some of the Bloc's demands. In the lead up to the February revolution 1917, it is often argued to play a crucial role in the uprising's success through the suggestion to Tsar Nicholas II that he should establish a 'government of public confidence'. The Tsar instead made little attempt to make political reform or slip into a constitutional monarch that, potentially, could have saved the Romanov dynasty. References 1915 establishments in the Russian Empire Defunct political party alliances in Russia Political parties established in 1915 Political parties in the Russian Empire Political parties of the Russian Revolution