Serving on the House Naval Affairs Committee, Izac was considered a potential candidate for greater positions of power. His name came up in 1940 as possible candidate to become the Assistant Secretary for the Navy, but Izac publicly announced at the time that he wanted to remain in Congress, in a role that was focused on support of veterans. He eventually became chair of the House Naval Affairs Committee, and in this role had an oversight role in military efforts to defense matters on the Pacific coast, and was also involved in questioning Lieutenant General John L. DeWitt over the internment of Japanese Americans. This duty sent him on inspection tours of U.S. bases in the Pacific during the war. He also pushed against efforts for a post-war downsizing of U.S. military bases in the Pacific.