Vaublanc now sided with the constitutional monarchists and joined the "Amis de la Constitution" (dubbed the "Club des Feuillants") with 263 other colleagues out of the 745 deputies. He became one of its principal figures, along with Jacques Claude Beugnot, Mathieu Dumas and Jaucourt, after the departure of Barnave and C. Lameth. He vigorously opposed revolutionary governments and was characterised by his loyalty to the King, his opposition to repressive measures against rebellious priests and to laws confiscating the goods of émigrés, and his denunciation of the massacres at Avignon. Debate became steadily more extreme. The crowds attending these debates often shouted at him (as they did at Charles de Lacretelle) ""À la lanterne!"" Nicolas de Condorcet, his hostile colleague in the Legislative Assembly in 1791, said of him: "There are, at all meetings, these noisy air-headed orators, who produce a great effect through the constant repetition of redundant inanities." Brissot, one of the chief Girondists in the Legislative Assembly, nicknamed him "le chef des bicaméristes".