Roosevelt defended the order as being necessary for military purposes and claimed that Japanese Americans posed a threat to national security.
For the majority of the war, Japanese Americans were essentially all compelled to abandon their homes and possessions and live in camps. Although it violated many of the most fundamental constitutional rights of Japanese Americans, the government justified this policy by citing national security.
Executive Order 9066 was contested by Fred Korematsu, but the Supreme Court determined that the necessity of the action during a time of war made it valid. The US government didn't try to make amends to people who had been interned until 1988.
Because he has the power to make executive orders under Article Two, he was justified. However, it can also be argued that it was unjustified because he questioned the motives of numerous American citizens, numbering in the millions. Due to their ancestry, they were suspected.
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