Laffitte was one of the earliest and most determined advocates for ousting Charles X and his ministers and establishing a new government under Louis Philippe I, the duc d'Orléans, whose father, Philippe Égalité, had supported the Revolution of 1789. Laffitte's home in Paris became a headquarters for the "Party of Movement" to make Louis-Philippe the "Citizen King" of a reformed constitutional monarchy. Against the background of popular insurrection in Paris and growing unrest in the provinces, the plan succeeded. Charles X fled to England, his ministers were arrested, Louis-Philippe I assumed the throne and Laffitte became president of the Council of Ministers and Minister of Finances (2 November 1830 – 13 March 1831). As it proved, Laffitte was much better as a banker and financier than as a king maker or political leader. His government, torn between the necessity for preserving order in France and the need to conciliate the Parisian populace, succeeded in doing neither. To moderate liberals in the Chamber of Deputies like Casimir Perier, and even for the king himself, his dealings with popular revolutionary figures such as General Lafayette were moving France dangerously toward the establishment of a republic. Perier refused to have anything to do with Laffitte's ministry. After 131 days of turmoil and indecision, Laffitte was forced to resign and Perier's "Party of Order" formed a new ministry. Laffitte would keep his seat in the Chamber after 1831, but he would never lead or be part of another ministry.