After the February Revolution of 1917 dethroned Tsar Nicholas II, the Russian provisional government tasked Vice Admiral Adrian Nepenin with overseeing the change of government in Finland. Nepenin started by inviting a handful of Finnish politicians to discuss the situation on March 17. Kallio represented the Agrarian League, and when the Finnish politicians the next day sent a delegation to Saint Petersburg to negotiate a cessation to the Russification campaign, Kallio was again a member. The delegation was successful, and Finland was permitted to assemble a fully parliamentary Senate. Kallio came to serve as Agrarian minister in the Senate of Oskari Tokoi, which took office March 26. Most of his time was spent trying to mediate the agrarian strikes and finding foodstuffs for the country, while the First World War raised the prices in Europe.