Izac subsequently moved to San Diego and was elected as a Democrat to California's 20th congressional district, where he chaired the House Naval Affairs Committee and had oversight of Naval activities in the Pacific during World War II. Despite initially being hesitant to enter the war and remaining cautious to expanded U.S. involvement, experiences touring Nazi concentration camps in 1945 ultimately hardened his resolve. Nonetheless, he lost his bid for a sixth term in Congress in 1946. Izac spent much of the rest of his life writing and farming in the Washington D.C. area and was the oldest living Medal of Honor recipient when he died in 1990 at 98.