However, both men joined the Constitutionalist movement following the coup of Victoriano Huerta in February 1913 against Francisco I. Madero. De la Huerta became Venustiano Carranza's chief clerk from 1915–16 as the Constitutionalist faction took power. He then became interim governor of his home state of Sonora (1917–18), as Carranza's grip on power loosened, consul general of Mexico in New York City (1918), and he also traveled to Washington, D.C. to argue for Mexico's neutrality in World War I.
Both men joined the Constitutionalist movement after Victoriano Huerta's coup against Francisco I. Madero in February 1913. De la Huerta worked as Venustiano Carranza's chief clerk from 1915 to 1916, when the Constitutionalist faction took control. He served as interim governor of Sonora (1917–18) as Carranza's influence waned, acted as consul general in New York City (1918), and traveled to Washington, D.C. to argue for Mexico's neutrality during World War I.