Following the Japanese attack on Pearl Harbor on December 7, 1942, the question of the loyalty of the Nisei to the United States had been a huge issue, culminating in the decision to incarcerate all persons of Japanese ancestry in American concentration camps.
Omura stated before the select committee of the 77th House of Representatives, that he was opposed to the mass incarceration of all American citizens of Japanese descent, based on inconclusive proof of their loyalty to the United States.