Seeing the poor organization of the national parties, he founded a "Center of National Republican propaganda" which provided opinion pieces in journals, helped candidates with leaflets, posters and films, and organized committees and speakers. The Center aimed to pull together conservatives into a united party supporting André Tardieu. In this he was opposed by Victor Perret, who felt this was a distraction from the Republican Federation. In 1932 de Kérillis tried for election in the 7th arrondissement of Paris, but was defeated. He finally won election to parliament in the elections of 26 April 1936. In parliament, de Kérillis was an independent Republican. He was a member of the Committee on Foreign Affairs. He opposed the cabinets of Léon Blum and Camille Chautemps, supported that of Édouard Daladier and opposed that of Paul Reynaud. He opposed the 40-hour week law and the law for resolution of labor disputes, and voted for paid leave. His main activity was in foreign affairs, where he was against the pacifist policy of the left-wing Popular Front, and expressed concern about France's military weakness. De Kérillis was the only conservative deputy to vote against the Munich Agreement. He described the agreement as shameful. He said that Germany was insatiable, respected only the strong and would show no pity to the weak, which France had shown herself to be. He said that far from becoming peaceful, Germany would become more demanding and terrible. In January 1939 he again spoke on foreign policy, saying that each time France abandoned an ally, she became weaker and less secure. He alternated between opposing an alliance with Russia, which he saw as interfering in French politics through the Communist party, and supporting an eastern alliance. By 1940 he was in favor of a broad coalition of states in Western, Central and Eastern Europe, including the USSR, to preserve the peace. In a January 1940 debate, he opposed expelling communists from parliament, calling those who supported the measure defeatist and pro-German. When Reynaud's cabinet fell on 16 June 1940, de Kérillis flew in a small plane piloted by his brother Hervé from Bordeaux to Jersey, from where the English took them to Exeter on 15 June 1940. De Kérillis met General Charles de Gaulle in London before going on to New York. He reached the United States in mid-July. He was not present in Vichy on 10 July 1940 when Marshal Philippe Pétain was voted full powers.